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Shear coating is a promising deposition method for upscaling device fabrication and enabling high throughput, and is furthermore suitable for translating to roll-to-roll processing. Although common polymer semiconductors (PSCs) are solution processible, they are still prone to mechanical failure upon stretching, limiting applications in e.g., elect...
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... our recent work, triblock copolymers (TBCs) consisting of an inner semiconducting PDPP-TT and two outer soft PDMS blocks were achieved through Stille coupling. While the content of the insulating PDMS block is very high, making up to 67 wt% of the block copolymer structure, the TBC possess relatively high charge carrier mobilities in the same range as the reference PDPP-TT copolymer, and it withstands numerous stretching cycles to 50% strain (up to 1500 cycles) without losing electrical functionality (Figure 1) [36]. While great efforts have been made to understand the behavior of pure PSCs and PSC/elastomer blends upon shear coating, to the best of our knowledge investigations on the influence of shear parameters on the morphology and electrical performance of semiconducting block copolymers is missing as of yet. ...
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Black phosphorus (BP) receives extensive attention in many fields such as energy storage, microelectronics, and optoelectronics due to its layer‐controlled direct bandgap, excellent carrier mobility, and unique anisotropy. However, in practical applications, atmospheric degradation and the random channel orientation make the actual performance of B...
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... The over-all reduction in charge carrier mobility of our devices, compared to previously reported values for PDPP-TT and analogous TBCs, [9] might be attributed to the use of spin-coating instead of shear-coating and the use of CHCl 3 as a solvent instead of chlorobenzene. Both factors usually lead to a lower crystallinity and molecular packing, thereby impeding charge transport [44][45][46]. ...
... The nearly constant A 0-0 /A 0-1 ratio suggests a balanced Hand J-like aggregation. [45,46] This balance is likely due to the structural similarity between TBC40 and PDMS, arising from the large PDMS blocks flanking the PDPP-TT unit in TBC40. This similarity implies the absence of repulsive interactions between the polymers that would encourage the formation of larger ordered aggregates and, consequently, reduced phase separation compared to the blends of PDPP-TT and TBC85. ...
... [32] A D value of 1.5 for the 0-0 peak along with the red shift of the peak for the wire sample indicates a higher molecular order within the polymer which is consistent with literature. [33] Therefore, the polarized absorption spectra analysis corroborates that the birefringence observed in the wires under POM as evidenced in Figure 4 is due to a higher degree of polymer chain order than that of the film phase. ...
Conjugated polymers often show efficient charge carrier transport along their backbone which is a primary factor in the electrical behavior of Organic Field Effect Transistor (OFETs) devices fabricated from these materials. Herein, a solution shearing procedure is reported to fabricate micro/nano wires from a diketopyrrolopyrrole (DPP)‐based polymer. Millimeter to nanometer long polymer wires orientated in the coating direction are developed after a thorough analysis of the deposition conditions. It shows several morphological regimes—film, transition, and wires and experimentally derive a phase diagram for the parameters coating speed and surface energy of the substrate. The as‐fabricated wires are isolated, which is confirmed by optical, atomic force, and scanning electron microscopy. Beside the macroscopic alignment of wires, cross‐polarized optical microscopy images show strong birefringence suggesting a high degree of molecular orientation. This is further substantiated by polarized UV‐Vis‐NIR spectroscopy, selected area electron diffraction transmission electron microscopy, and grazing‐incidence wide‐angle X‐ray scattering. Finally, an enhanced electrical performance of single wire OFETs is observed with a 15‐fold increase in effective charge carrier mobility to 1.57 cm² V⁻¹ s⁻¹ over devices using films (0.1 cm² V⁻¹ s⁻¹) with similar values for on/off current ratio and threshold voltage.
... π-conjugated polymers have recently attracted an increasing interest due to their superior benefits such as their ease of solution processing, rapid switching speeds, high coloration efficiency, and rich color palette during usage for electrochromic devices. π-conjugated polymers have a wide range of optical and electrochemical applications in field-effect transistors [6,7], capacitors [8,9], photovoltaic cells [10,11], light-emitting diodes [12,13], catalyst supports [14,15], and sensors [16,17]. ...
... anal. calc.) for C32H24N2 was: C, 88.04%; H, 5.54%; and N, 6.42% with C, 87.92%; H, 5.50%; and N, 6.31% found. ...
... anal. calc.) for C 32 H 24 N 2 was: C, 88.04%; H, 5.54%; and N, 6.42% with C, 87.92%; H, 5.50%; and N, 6.31% found. ...
Four 1,4-bis((9H-carbazol-9-yl)methyl)benzene-containing polymers (PbCmB, P(bCmB-co-bTP), P(bCmB-co-dbBT), and P(bCmB-co-TF)) were electrosynthesized onto ITO transparent conductive glass and their spectral and electrochromic switching performances were characterized. The PbCmB film displayed four types of color variations (bright gray, dark gray, dark khaki, and dark olive green) from 0.0 to 1.2 V. P(bCmB-co-bTP) displayed a high transmittance variation (∆T = 39.56% at 685 nm) and a satisfactory coloration efficiency (η = 160.5 cm2∙C−1 at 685 nm). Dual-layer organic electrochromic devices (ECDs) were built using four bCmB-containing polycarbazoles and poly(3,4-ethylenedioxythiophene) (PEDOT) as anodes and a cathode, respectively. PbCmB/PEDOT ECD displayed gainsboro, dark gray, and bright slate gray colors at −0.4 V, 1.0 V, and 2.0 V, respectively. The P(bCmB-co-bTP)/PEDOT ECD showed a high ∆T (40.7% at 635 nm) and a high coloration efficiency (η = 428.4 cm2∙C−1 at 635 nm). The polycarbazole/PEDOT ECDs exhibited moderate open circuit memories and electrochemical redox stability. The characterized electrochromic properties depicted that the as-prepared polycarbazoles had a satisfactory application prospect as an electrode for the ECDs.
... Moreover, we demonstrated recently that the TBC can be shear-coated at high shearing speeds with almost no change in the electrical performance. 37 These results combined pave the way for this material to be utilized on flexible/stretchable substrates (e.g., foil, cross-linked PDMS) using low-cost and high-throughput coating techniques (e.g., doctor blade, roll to roll printing). ...
In this work, we explored the effect of solution-shearing processing parameters, coating speed and substrate temperature, on the electrical properties of solution-processed organic field-effect transistors (OFETs) based on 2-decyl-7-phenyl[1]benzothieno[3,2-b][1]benzothiophene (Ph-BTBT-C10) when green solvents are used. Organic semiconductor thin films were solution-sheared with various coating speeds and substrate temperatures and film morphologies/microstructures were investigated by atomic force microscopy (AFM) and X-ray diffraction (XRD) analysis. Our data demonstrate that crystal growth of Ph-BTBT-C10 molecule is highly affected by the two solution shearing processing parameters and, especially, the OFET devices fabricated with cyclohexanone as green solvent exhibited the charge carrier mobility as high as 5.1 cm²/Vs with optimized processing condition. This work could further provide a guideline for process optimization for fabricating high-performance green solvent-processed OFETs.
