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Understanding the Performance-Limiting Factors of Cs2AgBiBr6 Double-Perovskite Solar Cells
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-06-04 , DOI: 10.1021/acsenergylett.0c01020
Giulia Longo 1, 2 , Suhas Mahesh 2 , Leonardo R. V. Buizza 2 , Adam D. Wright 2 , Alexandra J. Ramadan 2 , Mojtaba Abdi-Jalebi 3, 4 , Pabitra K. Nayak 5 , Laura M. Herz 2 , Henry J. Snaith 2
Affiliation  

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.

中文翻译:

了解Cs 2 AgBiBr 6双钙钛矿太阳能电池的性能限制因素

最近,双钙钛矿已经成为光伏应用中铅基卤化物钙钛矿的可能替代品。特别地,由于Cs 2 AgBiBr 6的环境稳定性,低毒性和有希望的光电特性,它已成为数项研究的主题。尽管具有这些令人鼓舞的特征,但基于这种双重钙钛矿的太阳能电池的性能仍然很低,这表明需要解决严重的局限性。在这项工作中,我们结合实验和理论研究表明,短的电子扩散长度是导致Cs 2 AgBiBr 6太阳能电池性能受限的主要原因之一。在半透明Cs 2 AgBiBr上使用EQE测量我们估计6个太阳能电池的电子扩散长度仅为30 nm,并通过太赫兹光​​谱证实了该值。通过使用光热偏转光谱和表面光电压测量,我们将有限的电子扩散长度与高电子陷阱密度相关联。我们的发现突出显示了影响这种双重钙钛矿的重要缺陷,显示了克服的挑战,并暗示了提高Cs 2 AgBiBr 6太阳能电池效率的可能途径。
更新日期:2020-07-10
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