Charge Injection at the Heterointerface in Perovskite CH3NH3PbI3 Solar Cells Studied by Simultaneous Microscopic Photoluminescence and Photocurrent Imaging Spectroscopy

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• 作者：Daiki Yamashita ; Taketo Handa ; Toshiyuki Ihara ; Hirokazu Tahara ; Ai Shimazaki ; Atsushi Wakamiya ; Yoshihiko Kanemitsu
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2016
• 出版时间：August 18, 2016
• 年：2016
• 卷：7
• 期：16
• 页码：3186-3191
• 全文大小：423K
• 年卷期：0
• ISSN：1948-7185

文摘

Charge carrier dynamics in perovskite CH₃NH₃PbI₃ solar cells were studied by means of microscopic photoluminescence (PL) and photocurrent (PC) imaging spectroscopy. The PL intensity, PL lifetime, and PC intensity varied spatially on the order of several tens of micrometers. Simultaneous PL and PC image measurements revealed a positive correlation between the PL intensity and PL lifetime, and a negative correlation between PL and PC intensities. These correlations were due to the competition between photocarrier injection from the CH₃NH₃PbI₃ layer into the charge transport layer and photocarrier recombination within the CH₃NH₃PbI₃ layer. Furthermore, we found that the decrease in the carrier injection efficiency under prolonged light illumination leads to a reduction in PC, resulting in light-induced degradation of solar cell devices. Our findings provide important insights for understanding carrier injection at the interface and light-induced degradation in perovskite solar cells.