表面光电压
钙钛矿(结构)
光伏
光电子学
材料科学
光谱学
钙钛矿太阳能电池
薄膜
光伏系统
开路电压
太阳能电池
电压
分析化学(期刊)
纳米技术
化学
电气工程
物理
量子力学
结晶学
工程类
色谱法
作者
Lee Barnea-Nehoshtan,Saar Kirmayer,Eran Edri,Gary Hodes,David Cahen
摘要
The field of organo-lead perovskite absorbers for solar cells is developing rapidly, with open-circuit voltage of reported devices already approaching the maximal theoretical voltage. Obtaining such high voltages on spun-cast or evaporated thin films is intriguing and calls for detailed investigation of the source of photovoltage in those devices. We present here a study of the roles of the selective contacts to methylammonium lead iodide chloride (MAPbI3-xClx) using surface photovoltage spectroscopy. By depositing and characterizing each layer at a time, we show that the electron-extracting interface is more than twice as effective as the hole-extracting interface in generating photovoltage, for several combinations of electrode materials. We further observe the existence of an electron-injection related spectral feature at 1.1 eV, which might bear significance for the cell's operation. Our results illustrate the usefulness of SPV spectroscopy in highlighting gaps in cells efficiency and for deepening the understanding of charge injection processes in perovskite-based photovoltaics.
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