Emergence of Hysteresis and Transient Ferroelectric Response in Organo-Lead Halide Perovskite Solar Cells
Emergence of Hysteresis and Transient Ferroelectric Response in Organo-Lead Halide Perovskite Solar Cells
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DOI：
10.1021/jz502429u
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发表时间：
2015-01-01
影响因子：
5.7
通讯作者：
Miyasaka, Tsutomu
中科院分区：
文献类型：
--
作者：
Chen, Hsin-Wei;Sakai, Nobuya;Miyasaka, Tsutomu
尽管钙钛矿基太阳能电池的效率已经有了很大的进步，但对其电流-电压性能的滞后现象还没有完全了解。由于其复杂的结构，很难将其滞后行为归因于任何一种不同的成分，如钙钛矿体或不同的异质结界面。在有机卤化铅钙钛矿中，甲基铵碘铅钙钛矿(CH3NH3PbI3)具有铁电性质。研究表明，在暗环境中外加偏压引起的CH3NH3PbI3的瞬时铁电极化与光伏特性的滞后增强之间具有很强的相关性。结果表明，在光伏测量之前，CH3NH3PbI3光伏层的反向偏置极化(-0.3~-1.1V)产生了更强的磁滞，其程度随电池结构的不同而显著变化。这一现象被解释为钙钛矿薄膜中的剩余极化对光电流的影响，在没有介孔支架的平面钙钛矿结构中，这种影响最大。
Although there has been rapid progress in the efficiency of perovskite-based solar cells, hysteresis in the current-voltage performance is not yet completely understood. Owing to its complex structure, it is not easy to attribute the hysteretic behavior to any one of different components, such as the bulk of the perovskite or different heterojunction interfaces. Among organo-lead halide perovskites, methylammonium lead iodide perovskite (CH3NH3PbI3) is known to have a ferroelectric property. The present investigation reveals a strong correlation between transient ferroelectric polarization of CH3NH3PbI3 induced by an external bias in the dark and hysteresis enhancement in photovoltaic characteristics. Our results demonstrate that the reverse bias poling (-0.3 to -1.1 V) of CH3NH3PbI3 photovoltaic layers prior to the photocurrent-voltage measurement generates stronger hysteresis whose extent changes significantly by the cell architecture. The phenomenon is interpreted as the effect of remanent polarization in the perovskite film on the photocurrent, which is most enhanced in planar perovskite structures without mesoporous scaffolds.