Temperature-Dependent Polarization in Field-Effect Transport and Photovoltaic Measurements of Methylammonium Lead Iodide

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• 作者：John G. Labram ; Douglas H. Fabini ; Erin E. Perry ; Anna J. Lehner ; Hengbin Wang ; Anne M. Glaudell ; Guang Wu ; Hayden Evans ; David Buck ; Robert Cotta ; Luis Echegoyen ; Fred Wudl ; Ram Seshadri ; Michael L. Chabinyc
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2015
• 出版时间：September 17, 2015
• 年：2015
• 卷：6
• 期：18
• 页码：3565-3571
• 全文大小：362K
• ISSN：1948-7185

文摘

While recent improvements in the reported peak power conversion efficiency (PCE) of hybrid organic鈥搃norganic perovskite solar cells have been truly astonishing, there are many fundamental questions about the electronic behavior of these materials. Here we have studied a set of electronic devices employing methylammonium lead iodide ((MA)PbI₃) as the active material and conducted a series of temperature-dependent measurements. Field-effect transistor, capacitor, and photovoltaic cell measurements all reveal behavior consistent with substantial and strongly temperature-dependent polarization susceptibility in (MA)PbI₃ at temporal and spatial scales that significantly impact functional behavior. The relative PCE of (MA)PbI₃ photovoltaic cells is observed to reduce drastically with decreasing temperature, suggesting that such polarization effects could be a prerequisite for high-performance device operation.