钙钛矿(结构)
能量转换效率
吸收(声学)
量子效率
材料科学
卤化物
光电子学
电流密度
衰减系数
光伏系统
电压
化学
光学
无机化学
物理
复合材料
电气工程
结晶学
工程类
量子力学
作者
Curtis Walkons,Rubaiya Murshed,Shubhra Bansal
出处
期刊:Solar RRL
[Wiley]
日期:2020-08-16
卷期号:4 (10)
被引量:25
标识
DOI:10.1002/solr.202000299
摘要
Optoelectronic properties of organic–inorganic halide perovskites are exceptional with solar cells showing efficiency comparable with conventional photovoltaic technologies. However, with issues of material stability and toxicity of Pb, it is important to understand if Pb can be replaced while maintaining the high power conversion efficiencies of (FA,MA,Cs)Pb(I,Br) 3 . Herein, practical efficiency limits of Pb and Pb‐free perovskite absorbers are analyzed using a 1D simulator for n‐i‐p or p‐i‐n device structures. SCAPS‐1D baseline models for perovskite absorber materials with and without Pb are developed to numerically reproduce the experimental current density–voltage ( JV ) and external quantum efficiency (EQE) of champion devices from literature. From these baseline models, the efficiency limits are determined based on optimizing the interface band alignments, reduction in midgap defect density, increased absorption coefficient, and no parasitic losses. SCAPS‐1D simulations suggest that 1) theoretically determined efficiency limit of Cs 2 PtI 6 perovskites is comparable with (FA,MA,Cs)Pb(I,Br) 3 perovskites, 2) FA 4 GeSbCl 12 is a promising photoabsorber; and 3) for efficient photoconversion with Sn‐, Ge‐, Ti‐, or Ag‐based compounds, a reduction of defect density and increase in absorption coefficient is needed.
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