Comparative studies of optoelectrical properties of prominent PV materials: Halide Perovskite, CdTe, and GaAs
| Autor: | Jinsong Huang, Qiong Chen, Michael J. DiNezza, Wu-Qiang Wu, Yong-Hang Zhang, Henan Liu, Yucheng Liu, Jose Castaneda, Maxwell B. Lassise, Wanyi Nie, Shangshang Chen, Daniel J. Friedman, Shengzhong Liu, Fan Zhang, Aditya D. Mohite, Yong Zhang |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Photoluminescence Passivation FOS: Physical sciences Applied Physics (physics.app-ph) 02 engineering and technology 010402 general chemistry 7. Clean energy 01 natural sciences Photovoltaics General Materials Science Diffusion (business) Perovskite (structure) Thermal equilibrium Condensed Matter - Materials Science business.industry Mechanical Engineering Materials Science (cond-mat.mtrl-sci) Physics - Applied Physics 021001 nanoscience & nanotechnology Condensed Matter Physics Cadmium telluride photovoltaics 0104 chemical sciences Mechanics of Materials Optoelectronics 0210 nano-technology business Excitation |
| Popis: | We compare three representative high performance PV materials: halide perovskite MAPbI3, CdTe, and GaAs, in terms of photoluminescence (PL) efficiency, PL lineshape, carrier diffusion, and surface recombination and passivation, over multiple orders of photo-excitation density or carrier density appropriate for different applications. An analytic model is used to describe the excitation density dependence of PL intensity and extract the internal PL efficiency and multiple pertinent recombination parameters. A PL imaging technique is used to obtain carrier diffusion length without using a PL quencher, thus, free of unintended influence beyond pure diffusion. Our results show that perovskite samples tend to exhibit lower Shockley–Read–Hall (SRH) recombination rate in both bulk and surface, thus higher PL efficiency than the inorganic counterparts, particularly under low excitation density, even with no or preliminary surface passivation. PL lineshape and diffusion analysis indicate that there is considerable structural disordering in the perovskite materials, and thus photo-generated carriers are not in global thermal equilibrium, which in turn suppresses the nonradiative recombination. This study suggests that relatively low point-defect density, less detrimental surface recombination, and moderate structural disordering contribute to the high PV efficiency in the perovskite. This comparative photovoltaics study provides more insights into the fundamental material science and the search for optimal device designs by learning from different technologies. |
| Databáze: | OpenAIRE |
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