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Nanostructure based perovskite solar cells with high performance are the focus of study in current work, keeping in view the improvement in cell efficiency. In the first part of the study, a plane-layered solar cell is studied by adding a 1D Photonic Crystal (1D PhC) at the bottom of the cell in order to facilitate the photon rotation process. Howe...
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... proposed solar cell structure (Fig. 1) comprises perovskite materials based on organic-inorganic halides (CH 3 NH 3 PbX 3 , where X = Cl, Br, and I) with a safeguard layer of ∼ 700 nm, a hole transport layer (HTL) of P3HT -poly(3-hexylthiophène), and an effective electron transport layer (ETL) of zinc sulfide (ZnS). The thickness of the HTL and ETL layers is kept at ∼ 20 ...
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... structure due to the reuse of reflected photons. The thickness of a 1D photonic crystal was set to be one-fourth of the overall thickness of the cell. Actually, the 1D photonic crystal is a stack of 7 pairs of Ge/SiO 2 (n h /n l = 3.5/1.46). This ratio is decided by the center wavelength, λd. The impact of the center wavelength is depicted in Fig. 1, which outlines the impact of the 1D PhC. It has been observed that the selection of the center wavelength is more important for thinner cells than the thicker ones. For thicker solar cells, the maximum number of incident photons can be ingested, which ultimately reduces the retention of photons. Moreover, it has also been noticed that ...
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... of the center wavelength is more important for thinner cells than the thicker ones. For thicker solar cells, the maximum number of incident photons can be ingested, which ultimately reduces the retention of photons. Moreover, it has also been noticed that the selection of the center wavelength is not vital for a thicker solar cell, as shown in Fig. 1. The observations revealed that the center wavelength λd of 0.60 µm can propose leading execution for solar cells with overall thickness in the range from 5 µm to 20 ...
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... values of the varying parameters are the same as before. As a result, the pair layer thickness in the photonic crystal increases linearly from 50 nm to 220 nm and then decreases linearly from 220 nm to 50 nm to achieve a higher PCE of the cell. In this case, after using such a thick layer, the structure would be nearly level. Fig. 1 shows that three distinctive assumptions approximately create the cell. In each hypothesis, the primary structure of the photonic crystal was optimized to investigate the impacts of three structures on cell performance. Fig. 5 shows the absorption of incident solar spectra, J-V curve, and quantum efficiency vs. wavelength. The ...
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Citations
... Metamaterials, such as multilayered structures composed of alternative lossy metal-dielectric slabs [1], [2], resonators with multiband response [3]- [5], or complex epsilon-nearzero (ENZ) films [6]- [9], have been explored for achieving mid-infrared (mid-IR) broadband emission and absorption with omnidirectional or some specific angle range. The ability to control broadband thermal emission in the mid-IR range is important for critical applications including radiative cooling [10]- [14], energy conversion [15]- [19], medical sensing and infrared heating [20], infrared (IR) camouflage [21], [22], and thermal sources for multiple gas/optical sensing [23]. However, previous studies based on reciprocal materials have encountered a fundamental limitation where equal emissivity/absorptivity is observed at two symmetric polar angles relative to the normal direction, which poses an obstacle to achieving higher energy conversion efficiency [24]. ...
Nonreciprocal thermal radiation can violate Kirchhoff’s law and exhibit different emissivity at symmetric polar angles relative to the normal direction. Realizing a mid-infrared broadband nonreciprocal thermal emitter with a wide emission angle range is a fundamental yet challenging task, particularly without the need for an external magnetic field. Here, we propose a nonreciprocal thermal emitter operating in the mid-infrared that achieves a significantly nonreciprocal thermal radiation in a wavelength range from 12 μm to 20 μm, spanning a wide angular range from 16° to 88°. This is achieved by utilizing a multilayered Weyl semimetal (WSM)/dielectric structure, which takes the advantage of the strong nonreciprocity of WSMs with different Fermi levels and epsilon-near-zero-induced Brewster modes. The results provide a wider angular range in the broad mid-infrared band compared to previous attempts. The robustness of the nonreciprocal radiation is confirmed through wavelength-averaged emissivity across the azimuth angle φ range from 0° to 360°. Some possible materials and nanostructures as dielectric layers are discussed, showcasing the flexibility and reliability of the design. This work holds promising potential applications such as enhanced radiative cooling, thermal emitters for medical sensing and infrared heating, energy conversion, etc.
