Space-charge-limited electron and hole currents in hybrid organic-inorganic perovskites
Space-charge-limited electron and hole currents in hybrid organic-inorganic perovskites
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DOI：
10.1038/s41467-020-17868-0
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发表时间：
2020-08-11
影响因子：
16.6
通讯作者：
Wetzelaer, Gert-Jan A. H.
中科院分区：
文献类型：
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作者：
Alvar, Mohammad Sajedi;Blom, Paul W. M.;Wetzelaer, Gert-Jan A. H.
有机-无机杂化钙钛矿材料在太阳能电池和发光二极管方面具有广阔的应用前景。然而，在这些半导体中，由于它们的混合电子-离子特性，电子和空穴的基本电流-电压行为仍然知之甚少。在这里，我们提出了在典型的钙钛矿甲基铵碘化铅（MAPbI（3））的空间电荷限制的电子和空穴电流的分析。我们证明了介电常数的频率依赖性起着至关重要的作用，在分析空间电荷限制的电流和它们对电压扫描速率和温度的依赖性。使用一个混合的电子-离子器件模型的基础上实验确定的参数，单载流子器件的电流-电压特性准确地再现。我们的研究结果表明，在我们的解决方案处理MAPbI（3）薄膜的电子传输占主导地位的空穴。此外，我们表明，在电流-电压特性的滞后的方向提供了一个指纹的优势移动离子物种的迹象。空间电荷限制电流被广泛用于表征半导体中的电荷输运。在这里，作者描述了金属卤化物钙钛矿中的空间电荷限制的电子和空穴电流，适用于新兴的太阳能电池。高介电常数和离子运动强烈影响电流。
Hybrid organic-inorganic perovskites are promising materials for the application in solar cells and light-emitting diodes. However, the basic current-voltage behavior for electrons and holes is still poorly understood in these semiconductors due to their mixed electronic-ionic character. Here, we present the analysis of space-charge-limited electron and hole currents in the archetypical perovskite methyl ammonium lead iodide (MAPbI(3)). We demonstrate that the frequency dependence of the permittivity plays a crucial role in the analysis of space-charge-limited currents and their dependence on voltage scan rate and temperature. Using a mixed electronic-ionic device model based on experimentally determined parameters, the current-voltage characteristics of single-carrier devices are accurately reproduced. Our results reveal that in our solution processed MAPbI(3) thin films transport of electrons dominates over holes. Furthermore, we show that the direction of the hysteresis in the current-voltage characteristics provides a fingerprint for the sign of the dominant moving ionic species. Space-charge-limited currents are widely used to characterize charge transport in semiconductors. Here, the authors characterize space-charge-limited electron and hole currents in metal-halide perovskites, applicable in emerging solar cells. The currents are strongly influenced by the high permittivity and ion motion.