Comparative studies of optoelectrical properties of prominent PV materials: Halide perovskite, CdTe, and GaAs

MATERIALS TODAY

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Article

Zhang, Fan¹  Castaneda, Jose F.¹  Chen, Shangshang²  Wu, Wuqiang²  DiNezza, Michael J.³  Lassise, Maxwell³  Nieg, Wanyi⁴  Mohite, Aditya^5,6  Liu, Yucheng⁷  Liu, Shengzhong⁷  Friedman, Daniel⁸  Liu, Henan¹  Chen, Qiong¹  Zhang, Yong-Hang³  Huang, Jinsong²  Zhang, Yong¹ 

[1] Univ North Carolina Charlotte, Dept Elect & Comp Engn, Charlotte, NC 28223 USA

[2] Univ N Carolina, Dept Appl Phys Sci, Chapel Hill, NC 27599 USA

[3] Arizona State Univ, Sch Elect Comp & Energy Engn, Tempe, AZ 85287 USA

[4] Los Alamos Natl Lab, Mat Phys & Applicat Div, Los Alamos, NM 87545 USA

[5] Rice Univ, Dept Chem & Biomol Engn, Houston, TX 77005 USA

[6] Rice Univ, Dept Mat Sci & Nanoengn, Houston, TX 77005 USA

[7] Shaanxi Normal Univ, Sch Mat Sci & Engn, Key Lab Appl Surface & Colloid Chem, Natl Minist Educ,Inst Adv Energy Mat, Xian 710062, Peoples R China

[8] Natl Renewable Energy Lab, Golden, CO 80401 USA

关键词: PV materials;    Organic-inorganic hybrid;    Photoluminescence efficiency;    SRH recombination;    Carrier diffusion;    Passivation;   

DOI  :  10.1016/j.mattod.2020.01.001

来源: Elsevier

【 摘 要 】

We compare three representative high performance PV materials: halide perovskite MAPbI(3), 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.

【 授权许可】

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