Shan Dan, Tong Guoqing, Cao Yunqing, Tang Mingjun, Xu Jun, Yu Linwei, Chen Kunji
National Laboratory of Solid State Microstructures and School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
School of Electronic and Information Engineering, Yangzhou Polytechnic Institute, Jiangsu, 225127, China.
Nanoscale Res Lett. 2019 Jun 18;14(1):208. doi: 10.1186/s11671-019-3022-y.
Hybrid organic-inorganic perovskites (HOIPs) exhibit long electronic carrier diffusion length, high optical absorption coefficient, and impressive photovoltaic device performance. At the core of any optoelectronic device lie the charge transport properties, especially the microscopic mechanism of scattering, which must efficiently affect the device function. In this work, CHNHPbI (MAPbI) films were fabricated by a vapor solution reaction method. Temperature-dependent Hall measurements were introduced to investigate the scattering mechanism in MAPbI films. Two kinds of temperature-mobility behaviors were identified in different thermal treatment MAPbI films, indicating different scattering mechanisms during the charge transport process in films. We found that the scattering mechanisms in MAPbI films were mainly influenced by the decomposed PbI components, which could be easily generated at the perovskite grain boundaries (GBs) by releasing the organic species after annealing at a proper temperature. The passivation effects of PbI in MAPbI films were investigated and further discussed with emphasis on the scattering mechanism in the charge transport process.
有机-无机杂化钙钛矿（HOIPs）具有长的电子载流子扩散长度、高的光吸收系数以及令人瞩目的光伏器件性能。任何光电器件的核心在于电荷传输特性，尤其是散射的微观机制，它必定会有效地影响器件功能。在这项工作中，通过气相溶液反应法制备了CHNHPbI（MAPbI）薄膜。引入了随温度变化的霍尔测量来研究MAPbI薄膜中的散射机制。在不同热处理的MAPbI薄膜中识别出了两种温度-迁移率行为，这表明薄膜中电荷传输过程存在不同的散射机制。我们发现，MAPbI薄膜中的散射机制主要受分解的PbI组分影响，在适当温度下退火后，通过释放有机物种，这些组分很容易在钙钛矿晶界（GBs）处生成。研究了PbI在MAPbI薄膜中的钝化作用，并着重讨论了电荷传输过程中的散射机制。
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