限制
钙钛矿(结构)
光伏系统
光电子学
材料科学
工程物理
电子
扩散
卤化物
化学
物理
结晶学
无机化学
电气工程
机械工程
热力学
工程类
量子力学
作者
Giulia Longo,Suhas Mahesh,Leonardo R. V. Buizza,Adam D. Wright,Alexandra J. Ramadan,Mojtaba Abdi‐Jalebi,Pabitra K. Nayak,Laura M. Herz,Henry J. Snaith
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2020-06-04
卷期号:5 (7): 2200-2207
被引量:160
标识
DOI:10.1021/acsenergylett.0c01020
摘要
Double perovskites have recently emerged as possible alternatives to lead-based halide perovskites for photovoltaic applications. In particular, Cs2AgBiBr6 has been the subject of several studies because of its environmental stability, low toxicity, and its promising optoelectronic features. Despite these encouraging features, the performances of solar cells based on this double perovskite are still low, suggesting severe limitations that need to be addressed. In this work we combine experimental and theoretical studies to show that the short electron diffusion length is one of the major causes for the limited performance of Cs2AgBiBr6 solar cells. Using EQE measurements on semitransparent Cs2AgBiBr6 solar cells we estimate the electron diffusion length to be only 30 nm and corroborated this value by terahertz spectroscopy. By using photothermal deflection spectroscopy and surface photovoltage measurements we correlate the limited electron diffusion length with a high density of electron traps. Our findings highlight important faults affecting this double perovskite, showing the challenges to overcome and hinting to a possible path to improve the efficiency of Cs2AgBiBr6 solar cells.
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