Control of I鈥揤 Hysteresis in CH3NH3PbI3 Perovskite Solar Cell

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• 作者：Hui-Seon Kim ; In-Hyuk Jang ; Namyoung Ahn ; Mansoo Choi ; Antonio Guerrero ; Juan Bisquert ; Nam-Gyu Park
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2015
• 出版时间：November 19, 2015
• 年：2015
• 卷：6
• 期：22
• 页码：4633-4639
• 全文大小：426K
• ISSN：1948-7185

文摘

Mismatch of current (I)-voltage (V) curves with respect to the scan direction, so-called I鈥?i>V hysteresis, raises critical issue in MAPbI₃ (MA = CH₃NH₃) perovskite solar cell. Although ferroelectric and ion migration have been proposed as a basis for the hysteresis, origin of hysteresis has not been apparently unraveled. We report here on the origin of I鈥?i>V hysteresis of perovskite solar cell that was systematically evaluated by the interface-dependent electrode polarizations. Frequency (f)-dependent capacitance (C) revealed that the normal planar structure with the TiO₂/MAPbI₃/spiro-MeOTAD configuration showed most significant I鈥?i>V hysteresis along with highest capacitance (10^鈥? F/cm²) among the studied cell configurations. Substantial reduction in capacitance to 10^鈥? F/cm² was observed upon replacing TiO₂ with PCBM, indicative of the TiO₂ layer being mainly responsible for the hysteresis. The capacitance was intensively reduced to 10^鈥? F/cm² and C鈥?i>f feature shifted to higher frequency for the hysteresis-free planar structures with combination of PEDOT:PSS, NiO, and PCBM, which underlines the spiro-MeOTAD in part contributes to the hysteresis. This work is expected to provide a key to the solution of the problem on I鈥?i>V hysteresis in perovskite solar cell.