Erik M. J. Johansson

Uppsala University | UU · Department of Chemistry - Ångström Laboratory

Solar cells based on perovskites have recently become a very promising technology based on low cost materials and the perovskite solar cells show very high efficiencies. However the solar cell perovskites generally contain lead, which is toxic, and this may be detrimental for future commercialization of these solar cells. Also tin based perovskite...

We report on perovskite (CH3NH3)PbI3-sensitized solid-state solar cells using spiro-OMeTAD, poly(3-hexylthiophene-2,5-diyl) (P3HT) and 4-(diethylamino)benzaldehyde diphenylhydrazone (DEH) as hole transport materials (HTMs) with a light to electricity power conversion efficiency of 8.5%, 4.5%, and 1.6%, respectively, under AM 1.5G illumination of 10...

The electronic structure and chemical composition of efficient CH3NH3PbI3 per- ovskite solar cell materials deposited onto mesoporous TiO2 were studied using photo- electron spectroscopy with hard X-rays. With this technique it is possible to directly measure the occupied energy levels of the perovskite as well as the TiO2 buried beneath, and there...

Efficient solid state dye-sensitized solar cells (sDSCs) were obtained using a small hole transport material, MeO-TPD, (N,N,N',N'-tetrakis(4-methoxyphenyl)benzidine) after an initial light soaking treatment. It was discovered that the light soak-ing treatment for the MeO-TPD based solar cells is essential in order to achieve the high efficiency (4....

Conductivity of methylammonium lead triiodide (MAPbI3) perovskite was measured on different mesoporous metal oxide scaffolds: TiO2, Al2O3, and ZrO2, as a function of incident light irradiation and temperature. It was found that MAPbI3 exhibits intrinsic charge separation, and its conductivity stems from a majority of free charge carriers. The cryst...

Despite considerable research efforts on photoelectrochemical water splitting over the past decades, practical application faces challenges by the absence of efficient, stable, and scalable photoelectrodes. Herein, we report a metal-halide perovskite-based photoanode for photoelectrochemical water oxidation. With a planar structure using mesoporous...

Bromide-based perovskites have large bandgaps, making them attractive for tandem solar cells developed to overcome the Shockley-Queisser limit. A perovskite solar cell architecture employs transporting layers to improve charge extraction and transport. Due to the wide variety of materials and preparation methods, it is critical to devise fast scree...

Recently, carbazole‐based self‐assembled monolayers (SAMs) have been utilized as hole transport layers (HTLs) in perovskite solar cells. However, their application in Sn or mixed Sn/Pb perovskite solar cells has been hindered by the poor wettability of the perovskite precursor solution on the carbazole surface. Here a self‐assembled bilayer (SAB) c...

An analysis is provided of MA-free Sn/Pb-perovskite solar cells fabricated using PEDOT:PSS, 2PACz, and Br-2PACz as the HTL. An efficiency of 19.51% has been reached by using Br-2PACz with improved device stability, thanks to suppressed recombination.

Renewable energy sources, such as wind‐ and solar power, are today increasingly important in order to reduce emissions from fossil‐based energy sources. However, the electricity from wind‐ and solar power varies in time and depends on weather conditions and time of the day. Therefore, to include a large fraction of electricity from these energy sou...

Lead halide perovskite solar cells have reached power conversion efficiencies during the past few years that rival those of crystalline silicon solar cells, and there is a concentrated effort to commercialize them. The use of gold electrodes, the current standard, is prohibitively costly for commercial application. Copper is a promising low-cost el...

In this work, efficient and bending durable flexible perovskite solar cells are obtained by modification of the perovskite film surface with 1- dodecanethiol (DT) followed by drop-casting of pre-dispersed thin nanosheets of MoS2. Our results show an enhancement in efficiency of the flexible device after the interface modification and revealed that...

Cs2AgBiBr6, has recently gained wide attention as a possible alternative to lead-halide perovskites, considering the nontoxicity and improved stability. However, this double perovskite suffers from defects, especially deep electron traps, severely hampering the photovoltaic performance. This work reports a simple method to control the double perovs...

Surface modification of perovskite films using a combination of 1-dodecanethiol (DT) and MoS2 nanosheets is investigated for perovskite solar cells. This surface modification is studied for two different types of perovskites, one with triple cations (CsFAMA) and one with double cations (FAMA), resulting in solar cell devices with power conversion e...

We present the synthesis and characterization of an efficient and low cost solar-driven electrolyzer consisting of Earth-abundant materials. The trimetallic NiFeMo electrocatalyst takes the shape of nanometer-sized flakes anchored to a fully carbon-based current collector comprising a nitrogen-doped carbon nanotube network, which in turn is grown o...

Lead bromide perovskite with high bandgap and good stability has aroused broad interest for utilization in perovskite solar cells (PSCs) with high photovoltage, especially as a candidate for the front cell of tandem solar cells. However, the efficiency of lead bromide PSCs is still much lower than the standard lead iodide PSCs, and the defects in t...

Lead‐free double perovskites, A2M⁺M′3+X6, are considered as promising alternatives to lead‐halide perovskites, in optoelectronics applications. Although iodide (I) and bromide (Br) mixing is a versatile tool for bandgap tuning in lead perovskites, similar mixed I/Br double perovskite films have not been reported in double perovskites, which may be...

In this work, four-terminal (4T) tandem solar cells were fabricated by using a methylammonium lead iodide (MAPbI3) perovskite solar cell (PSC) as front-cell and a lead sulfide (PbS) colloidal quantum dot solar cell (CQDSC) as back-cell. Different modifications of the tandem interlayer, at the interface between the sub-cells, were tested in order to...

High-end organic-inorganic lead halide perovskite semitransparent p-i-n solar cells for tandem applications use a phenyl-C61-butyric acid methyl ester (PCBM)/atomic layer deposition (ALD)-SnO x electron transport layer stack. Omitting the PCBM would be preferred for manufacturing, but has in previous studies on (FA,MA)Pb(Br,I)3 and (Cs,FA)Pb(Br,I)...

Time-resolved photoelectron spectroscopy can give insights into carrier dynamics and offers the possibility of element and site-specific information through the measurements of core levels. In this paper, we demonstrate that this method can access electrons dynamics in PbS quantum dots over a wide time window spanning from pico- to microseconds in...

Infrared PbS colloidal quantum dot (CQD)-based materials receive significant attention because of its unique properties. The PbS CQD ink that originates from ligand exchange of CQDs is highly potential for efficient and stable infrared CQD solar cells (CQDSCs) using low-temperature solution-phase processing. In this review, we present a comprehensi...

Lead halide perovskite quantum dots (PQDs), also called perovskite nanocrystals, are considered as one of the most promising class of photovoltaic materials for solar cells due to their prominent optoelectronic properties and simple preparation techniques. Remarkable achievements in the PQD solar cells (PQDSCs) have been obtained. In particular, th...

Energy efficient synthesis providing high quality crystalline thin films are highly desired in many applications. Here we devise a non-toxic solvent approach for production of highly crystalline MAPbI3 perovskite by exploiting diffusion aggregation processes. Isopropanol solution based methylammonium lead triiodide (MAPbI3) is used in this context,...

A R T I C L E I N F O Keywords: MAPbI 3 crystal growth Nano-beam electron diffraction High-angle annular dark-field imaging PL mapping Perovskite solar cells A B S T R A C T Energy efficient synthesis providing high quality crystalline thin films are highly desired in many applications. Here we devise a non-toxic solvent approach for production of...

Bismuth halide perovskites have recently been considered a potential alternative to lead halide analogues due to their low toxicity and high stability. However, the layered flake structure and wide bandgap limit their applications in perovskite solar cells (PSCs). We herein show that large grained all inorganic bismuth-based perovskites with a narr...

Lead bromide perovskite solar cells (PSCs) have attracted increasing interest partly due to the high open-circuit voltage that has been obtained. Here, we present a simple way to prepare PSCs based on formamidinium lead tribromide, FAPbBr 3 , by adding methylammounium chloride and methylammounium bromide into the precursor solution. With this metho...

This paper focuses on the development of 2-terminal CIGS-perovskite tandem solar cells by exploring a range of stack sequences and synthetic procedures for depositing the associated layers. In the end, we converged at a stack sequence composed of SLG/Mo/CIGS/CdS/i-ZnO/ZnO:Al/NiO/PTAA/Perovskite/LiF/PCBM/SnO2/ITO. With this architecture, we reached...

Silver Bismuth Iodide (Ag-Bi-I) light absorbers are interesting candidates as lead-free and low-toxic metal-halide materials for solar cell applications. In this work, the partial exchange of bismuth, Bi, with antimony, Sb, is investigated in samples prepared from a solution targeting stoichiometry AgBi2I7. Samples with a gradually increased exchan...

Transparent conducting electrodes which allow photons passing through and simultaneously transfers the charge carriers are critical for the construction of high-performance photovoltaic cells. Electrodes based on metal oxides, such as indium-doped tin oxide (ITO) or fluorine-doped tin oxide (FTO), may have limited application in new generation flex...

Inorganic CsPbI3 perovskite quantum dot (PQD) receives increasing attention for the application in the new generation solar cells, but the defects on the surface of PQDs significantly affect the photovoltaic performance and stability of solar cells. Herein, the amino acids are used as dual‐passivation ligands to passivate the surface defects of CsP...

Recent progress in colloidal quantum dot (CQD) based solar cells indicates that low toxic materials such as AgBiS2 nanocrystals (NCs) show potential in replacing toxic PbS and CdS CQDs in solar cell applications. In this study, an investigation on the importance of the composition and sensitivity toward synthesis conditions was performed by adjusti...

In this work, high performance four-terminal solution-processed tandem solar cells were fabricated by using dye-sensitized solar cells (DSSC) as top-cells and lead sulfide (PbS) colloidal quantum dot solar cells (CQDSC) as bottom-cells. For dye-sensitized top-cells, three different dye combinations were used while the titanium dioxide (TiO2) scatte...

Lead halide perovskite solar cells have significantly increased in both efficiency and stability over the last decade. An important aspect for their long-term stability are the reactions between the perovskite and other materials in the solar cell. This includes the contact materials and their degradation if they can potentially come into contact t...

Liquid‐state ligand exchange provides an efficient approach to passivate a quantum dot (QD) surface with small binding species and achieve a QD ink toward scalable QD solar cell (QDSC) production. Herein, experimental studies and theoretical simulations are combined to establish the physical principles of QD surface properties induced charge carrie...

Metal halide compounds with photovoltaic properties prepared from solution have received increased attention for utilization in solar cells. In this work, low-toxicity cesium bismuth iodides are synthesized from solution, and their photovoltaic and optical properties as well as electronic and crystal structures are investigated. The X-ray diffracti...

In this work, silver-bismuth-halide thin films, exhibiting low toxicity and good stability, were explored systemically by gradually substituting iodide, I, with bromide, Br, in AgBi2I7 system. It was found that the optical bandgap can be tuned by varying the I/Br ratio. Moreover, the film quality was improved when introducing a small amount of Br....

The interfacial properties between the perovskite layer and carbon electrode are critical for the photovoltaic performance of the carbon electrode-based perovskite solar cells (PSCs). Herein, a methylammonium lead mixed halide (MAPbIxBr3-x) perovskite layer in-situ grows on the top of methylammonium lead iodide (MAPbI3) perovskite layer forming MAP...

Surface properties of colloidal quantum dots (CQDs) are of great importance for the photoinduced charge carrier transportation and recombination in CQD solar cells, therefore dominating the photovoltaic performance. Herein, PbS CQD passivated using liquid-state ligand exchange (LSLX) and solid-state ligand exchange (SSLX) strategies are in detail i...

Inverted perovskite solar cells (PSCs) have been introduced as better candidate for roll-to-roll printing and scale-up than their conventional configuration counterparts, while their fabrication is technically more demanding. The common light absorbing layer in inverted PSCs is the single cation methylammonium lead iodide (MAPbI3) perovskite, where...

Dye-sensitized photocatalytic suspension system for wastewater treatment is still limited in practice due to particle aggregation, fast charge carrier recombination, poor stability and recycling issue. In this study, we combine TiO2 nano-crystalline film with D35 organic dye to fabricate a new visible-light photocatalyst D35-TiO2, which exhibits ex...

A hot‐injection synthesis method was used to synthesize low‐toxic Ag2S colloidal quantum dots (CQDs) with strong and broad light absorption as an ultra‐thin photo‐absorber in CQD heterojunction solar cells. Using iodide and sulfur linkers it was possible to accomplish efficient charge carrier extraction, resulting in a high photocurrent due to the...

4-tert-butylpyridine (t-BP) is commonly used in solid state dye-sensitized solar cells (ssDSSCs) to increase the photo-voltaic performance. In this report, the mechanism how t-BP functions as a favorable additive is investigated compre-hensively. ssDSSCs were prepared with different concentration of t-BP and a clear increase in efficiency was obser...

The photovoltaic characteristics of CsBi3I10 based solar cells with three dopant-free hole conducting polymers; TQ1, P3TI and P3HT, are investigated. The effect on charge generation and charge recombination in the solar cells using the different polymers are studied and the results show that the polymer strongly affects the device properties. Inter...

Presently, the most efficient lead halide perovskite solar cells are manufactured by using high-boiling point organic solvents to dissolve the perovskite precursor materials prior to the perovskite formation. Previously, efforts have been made to exchange the said solvents for water with some success. Herein, we build on that work to develop a proc...

Lightweight and flexible solar cells are highly interesting for new applications, such as in spacecraft, aircraft and personal pack load. PbS colloidal quantum dots (CQDs) have a broad and strong light absorption spectrum covering the ultraviolet-visible-near infrared region, allowing for incorporating of very thin CQD films in solar cells with hig...

Lead halide perovskites have a range of spectacular properties and interesting phenomena and are a serious candidate for the next generation of photovoltaics with high efficiencies and low fabrication costs. An interesting phenomenon is the anomalous hysteresis often seen in current–voltage scans, which complicates accurate performance measurements...

Efficient charge carrier extraction from a colloidal quantum dot (CQD) solid is crucial for high performance CQD solar cells (CQDSCs). Herein, highly ordered wrinkled MgZnO (MZO) thin films are demonstrated to improve the charge carrier extraction from PbS CQDSCs. The highly ordered wrinkled MZO thin films are prepared using a low-temperature combu...

Tremendous progress has recently been achieved in the field of perovskite solar cells (PSCs) as evidenced by impressive power conversion efficiencies (PCEs); but the high PCEs of >20% in PSCs has so far been mostly achieved by using the hole transport material (HTM) spiro-OMeTAD; however, the relatively low conductivity and high cost of spiro-OMeTA...

Organic inorganic metal halide perovskites (OIHPs) has emerged as promising photovoltaic materials the latest years. Many OIHPs, however, have complex material compositions with mixed cation and halide compositions, phase mixtures, as well as beneficial remains of PbI2 in the final solar cell materials where the complex material composition with du...

X-ray photoelectron spectroscopy is a powerful tool for the characterization of molecular and hybrid solar cells. This technique allows for atomic-level characterization of their components as well as for the determination of the electronic structure that governs the key conversion processes. In this chapter, we introduce the basic concepts of elec...

The compatibility of atomic layer deposition directly onto FAPBI3:MAPbBr3 perovskite films is investigated by exposing the perovskite films to the full or partial atomic layer deposition processes for the electron selective layer candidates ZnO and SnOx. Exposing the samples to the heat, the vacuum and even the counter reactant of H2O of the atomic...

Colloidal quantum dot (CQD) materials have high potential for realizing efficient, lightweight and flexible solar cells. To achieve highly efficient and flexible CQD solar cells, the electron transport layer (ETL), extracting electrons from the CQD solid layer, needs to be processed at a low-temperature and should also suppress interfacial recombin...

Perovskite solar cells, as a newly emerged solar energy conversion technology, have attracted tremendous attention in the solar cell community by demonstrating impressive enhancement in power conversion efficiencies. However, the high temperature and manually processed TiO2 underlayer prepared by spray pyrolysis has significantly limited the large-...

Supplementary

In this report a lead-free silver-bismuth-iodide (AgI:BiI3) with a crystal structure with space group R3m is investigated for use in solar cells. Devices based on the silver-bismuth-iodide deposited from solution on top of TiO2, and the conducting polymer P3HT as a hole transport layer, are prepared and the photovoltaic performance is very promisin...

Perovskite solar cells (PSCs) have recently emerged as one of the most promising technologies for solar-energy conversion because of their high efficiency and simple solution processability. The power-conversion efficiency (PCE) of PSCs has been improved from 3.8% to 22.1% during the last 7 years, which can even compete with that of traditional sil...

Hard x-ray photoelectron spectroscopy (HAXPES) has been used to study the bulk electronic structure of thin molecular films of the organic compounds 2,2’7,7’-tetrakis (N,N’-di-p-methoxyphenyl-amine)-9,9’-spiro-bifluorene (spiro-OMeTAD), 4-(diethylamino)-benzaldehyde-1,1)-diphenyl-hydrazone (DEH) and poly(3-hexylthiophene) (P3HT). Molecular layers o...

Organometallic halide perovskites (OMHPs) have recently emerged as a promising class of materials in photovoltaic technology. Here we present an in-depth investigation of the physics in these systems by measuring the photo-induced absorption (PIA) in OMHPs as a function of materials composition, excitation wavelength and modulation frequency. We re...

Hole transport matertial (HTM) as charge selective layer in perovskite solar cells (PSCs) plays an important role in achieving high power conversion efficiency (PCE). It is known that the dopants and additives are necessary in the HTM in order to improve the hole conductivity of the HTM as well as to obtain high efficiency in PSCs, but the additive...

Mixed ion perovskite solar cells (PSC) are manufactured with a metal-free hole contact based on press-transferred single-walled carbon nanotube (SWCNT) film infiltrated with 2,2,7,-7-tetrakis(N,N-di-p-methoxyphenylamine)-9,90-spirobifluorene (Spiro-OMeTAD). By means of maximum power point tracking, their stabilities are compared with those of stand...

Cesium and methyl ammonium bismuth iodides (Cs3Bi2I9 and MA3Bi2I9) are new low-toxic and air stable compounds in the perovskite solar cell family with promising characteristics. Here, the electronic structure and the nature of their optical transitions, dielectric constant and charge carrier properties are assessed for photovoltaic applications wit...

Single-walled carbon nanotubes (SWCNTs) show great potential as an alternative material for front electrodes in photovoltaic applications, especially for flexible devices. In this work, a press-transferred transparent SWCNT film was utilized as front electrode for colloidal quantum dot solar cells (CQDSCs). The solar cells were fabricated on both g...

Mixed-ion (FAPbI3)1-x(MAPbBr3)x perovskite solar cells have achieved power conversion efficiencies surpassing 20%. However, in order to obtain these high efficiencies the preparation is performed in a controlled inert atmosphere. Here, we report a procedure for manufacturing highly efficient solar cells with a mixed-ion perovskite in ambient atmosp...

The growth mechanism and dependence on precursor conditions are vital for creation of high quality crystalline materials in many fields. Here the growth from nano sized quantum dots to micro crystalline methyl ammonium lead tri-iodide (MAPbI3) perovskites prepared from isopropanol solution are reported. Isopropanol is more environmental friendly co...

The growth mechanism and dependence on precursor conditions are vital for creation of high quality crystalline materials in many fields. Here the growth from nano sized quantum dots to micro crystalline methyl ammonium lead tri-iodide (MAPbI3) perovskites prepared from isopropanol solution are reported. Isopropanol is more environmental friendly co...

Perovskite-absorber solar cells have become a research area with high interest for their efficient energy conversion. A clue to the high performance of the material is the long diffusion length of charge carriers, which depend on crystallinity and morphology. However, still the main difficulty is to gain reproducible performance which address quest...

Lead-based perovskites show very promising properties for use in solar cells, however, the toxicity of lead is a potential inhibitor for large-scale application of these solar cells. Here, a low-toxic bismuth halide, CsBi3I10, is synthesized from solution and the optical properties and crystal structure are compared with previously reported Cs3Bi2I...

Means to measure the temporal evolution following a photo-excitation in conjugated polymers are a key for the understanding and optimization of their function in applications such as organic solar cells. In this paper we study the electronic structure dynamics by direct pump-probe measurements of the excited electrons in such materials. Specificall...

This study presents new hole-transport materials (HTMs) to replace the central spiro linkage in spiro-OMeTAD by a CC bond in H11 and CC double bond in H12. This structural change results in a facile synthetic process and a significant change in the molecular geometry. Employing H11 as HTM in combination with mixed ion perovskite [HC(NH2)2]0.85(CH3N...

The hole transporting material (HTM) is an essential component in perovskite solar cells (PSCs) for efficient extraction and collection of the photo induced charges. Triphenylamine- and carbazole-based derivatives have extensively been explored as alternative and economical HTMs for PSCs. However, the improvement of their power conversion efficienc...

The effects of co-adsorbing the amphiphilic ruthenium based dye Z907 (cis-bis(isothiocyanato)(2,20-bipyr- idyl-4,40-dicarboxylato)(4,40-di-nonyl-20-bipyridyl)ruthenium(II)) with the co-adsorbent DPA (n-decylphosphonic acid) and with the organic dye D35 ((E)-3-(5-(4-(bis(2',4'-dibutoxybiphenyl-4-yl)amino)phenyl)thiophen-2-yl)-2-cyanoacrylic acid) on...

A series of simple alkylated triphenylamine molecules are designed and synthesized as hole transporting materials (HTMs) for perovskite solar cells. The effects of the alkyl chains on the photovoltaic performance are for the first time systematically investigated. A high efficiency of 17.33% is achieved by combining HTM X21 and the mixed-ion perovs...

Two novel low-cost fluorene-based hole transport materials (HTMs) HT1 and HT2 as alternatives to the expensive HTM Spiro-OMeTAD have been designed and synthesized for the application in perovskite solar cells (PSCs) and solid-state dye-sensitized solar cell (ssDSCs). The two HTMs were prepared through a facile two-step reaction from cheap starting...

Photoelectrochemical polymerization of poly(3, 4-ethylenedioxythiphene) (PEDOT) has recently been introduced and widely investigated for fabrication of the hole transporting material (HTM) in highly efficient solid state dye sensitized solar cells (sDSCs). In this work, the effects of the surface area and pore size of TiO2 film were for the first t...

Degradation of the materials in dye-sensitized solar cells at elevated temperatures is critical for use in real applications. Both during fabrication of the solar cell and under real working conditions the solar cells will be exposed to heat. In this work, mesoporous TiO2 electrodes sensitized with the dyes D35 and K77 were subject to heat-treatmen...

A high power conversion efficiency (PCE) of 5.5% was achieved by efficiently incorporating a diketopyrrolopyrrole-based dye with in-situ formed conducting polymer PEDOT hole transporting material (HTM), compared with a PCE of 2.9% for small molecular spiro-OMeTAD based solid-state dye solar cells (sDSCs). The high PCE for PEDOT-based sDSCs is mainl...

The electro-optics of thin-film stacks within photovoltaic devices plays a critical role for the exciton and charge generation and therefore the photovoltaic performance. The complex refractive indexes of each layer in heterojunction colloidal quantum dot (CQD) solar cells are measured and the optical electric field is simulated using the transfer...

Semitransparent photovoltaics have great potential, for example, in building-integration or in portable electronics. However, the front and back contact electrodes significantly affect the light transmission and photovoltaic performance of the complete device. Herein, the use of a semitransparent nanolayered metal/metal oxide electrode for a semitr...

The formation of CH3NH3PbI3 (MAPbI3) from its precursors is probably the most significant step in the control of the quality of this semiconductor perovskite material, which is highly promising for photovoltaic applications. Here we investigated the transformation of spin coated PbI2 films to MAPbI3 using a reaction with MAI in vapor phase, referre...

Semitransparent solar cells (SSCs) can open new photovoltaic applications in many areas. However, because of the fundamental trade-off between optical transparency and photovoltaic efficiency, it is of special importance to minimize additional optical losses such as from reflectance and parasitic absorption. In this work, a semitransparent colloida...

Interfacial charge recombination occurring at the interface between a colloidal quantum dot (CQD) solid and the electron collecting layer (ECL) in CQD solar cells significantly affects the charge carrier collection, therefore limiting the device photovoltaic performance. In this work CQD solar cells with an improved performance are reported by empl...

Dye-sensitized solar cells (DSCs) have been widely studied in the last two decades and start to be commercialized in the photovoltaic market. Comprehensive characterization is needed to fully understand and optimize the device performance and stability. In this review, we summarize different characterization methods for dye-sensitized solar cells w...

We demonstrate a high efficiency perovskite solar cell with a hybrid hole-transporting material-counter electrode based on a thin single-walled carbon nanotube (SWCNT) film and a drop-cast 2,2,7,-7-tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (Spiro-OMeTAD) hole-transporting material (HTM). The average efficiency of the solar cells wa...

The effects of alkoxy chain length in triarylamine based donor-acceptor organic dyes are investigated with respect to the electronic and molecular surface structures on the performance of solar cells and the electron lifetime. The dyes were investigated when adsorbed on TiO2 in a configuration that can be used for dye-sensitized solar cells (DSCs)....

The interfaces between different materials in the heterojunction colloidal quantum dot (QD) solar cell play an important role for charge carrier separation, recombination and collection. Here, an organic–inorganic hybrid p–i–n architecture for the heterojunction PbS QD solid solar cell is constructed to increase the charge extraction and reduce cha...

Solid-state dye sensitized solar cells (sDSCs) with organic small molecule hole transporting materials (HTMs) have limited efficiencies due to the incomplete pore filling of the HTMs in the thick mesoporous electrodes and the low hole conductivity of HTMs. Hereby, highly efficient sDSCs with power conversion efficiency of 7.11% and record photocurr...