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Self-Aggregation-Controlled Rapid Chemical Bath Deposition of SnO2 Layers and Stable Dark Depolarization Process for Highly Efficient Planar Perovskite Solar Cells.
ChemSusChem ( IF 7.5 ) Pub Date : 2020-05-25 , DOI: 10.1002/cssc.202000501 Yohan Ko 1 , Youbin Kim 1 , Chanyong Lee 1 , Taemin Kim 1 , Seungkyu Kim 1 , Yong Ju Yun 1 , Hui-Jeong Gwon 2 , Nam-Ho Lee 2 , Yongseok Jun 1
ChemSusChem ( IF 7.5 ) Pub Date : 2020-05-25 , DOI: 10.1002/cssc.202000501 Yohan Ko 1 , Youbin Kim 1 , Chanyong Lee 1 , Taemin Kim 1 , Seungkyu Kim 1 , Yong Ju Yun 1 , Hui-Jeong Gwon 2 , Nam-Ho Lee 2 , Yongseok Jun 1
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Planar perovskite solar cells (PSCs) incorporating n‐type SnO2 have attracted significant interest because of their excellent photovoltaic performance. However, the film fabrication of SnO2 is limited by self‐aggregation and inhomogeneous growth of the intermediate phase, which produces poor morphology and properties. In this study, a self‐controlled SnO2 layer is fabricated directly on a fluorine‐doped tin oxide (FTO) surface through simple and rapid chemical bath deposition. The PSCs based on this hydrolyzed SnO2 layer exhibit an excellent power conversion efficiency of 20.21 % with negligible hysteresis. Analysis of the electrochemical impedance spectroscopy on the charge transport dynamics indicates that the bias voltage influences both interfacial charge transportation and the ionic double layer under illumination. The hydrolyzed SnO2‐based PSCs demonstrate a faster ionic charge response time of 2.5 ms in comparison with 100.5 ms for the hydrolyzed TiO2‐based hysteretic PSCs. The results of quasi‐steady‐state carrier transportation indicate that a dynamic hysteresis in the J–V curves can be explained by complex ionic‐electronic kinetics owing to the slow ionic charge redistribution and hole accumulation caused by electrode polarization, which causes an increase in charge recombination. This study reveals that SnO2‐based PSCs lead to a stabilized dark depolarization process compared with TiO2‐based PSCs, which is relevant to the charge transport dynamics in the high‐performing planar SnO2‐based PSCs.
中文翻译：
高效平面钙钛矿太阳能电池的自聚集控制的快速化学浴沉积SnO2层和稳定的暗去极化过程。
包含n型SnO 2的平面钙钛矿太阳能电池（PSC）由于其出色的光伏性能而引起了人们的极大兴趣。但是，SnO 2的薄膜制备受到中间相的自聚集和不均匀生长的限制，这会导致不良的形貌和性能。在这项研究中，通过简单快速的化学浴沉积，在氟掺杂的氧化锡（FTO）表面上直接制造了自控SnO 2层。基于这种水解SnO 2的PSC该层的磁滞可以忽略不计，功率转换效率为20.21％。电化学阻抗谱对电荷传输动力学的分析表明，偏压在照射下既影响界面电荷传输又影响离子双层。水解的SnO 2基PSC的离子电荷响应时间为2.5 ms，而水解的TiO 2基滞后PSC的离子电荷响应时间为100.5 ms 。准稳态载流子传输的结果表明，J – V处存在动态滞后曲线可以用复杂的离子电子动力学来解释，这是由于电极极化引起的缓慢的离子电荷重新分布和空穴积累，从而导致电荷复合增加。这项研究表明，与基于TiO 2的PSC相比，基于SnO 2的PSC导致稳定的暗去极化过程，这与高性能平面SnO 2的PSC中的电荷传输动力学有关。
更新日期：2020-05-25
中文翻译：
高效平面钙钛矿太阳能电池的自聚集控制的快速化学浴沉积SnO2层和稳定的暗去极化过程。
包含n型SnO 2的平面钙钛矿太阳能电池（PSC）由于其出色的光伏性能而引起了人们的极大兴趣。但是，SnO 2的薄膜制备受到中间相的自聚集和不均匀生长的限制，这会导致不良的形貌和性能。在这项研究中，通过简单快速的化学浴沉积，在氟掺杂的氧化锡（FTO）表面上直接制造了自控SnO 2层。基于这种水解SnO 2的PSC该层的磁滞可以忽略不计，功率转换效率为20.21％。电化学阻抗谱对电荷传输动力学的分析表明，偏压在照射下既影响界面电荷传输又影响离子双层。水解的SnO 2基PSC的离子电荷响应时间为2.5 ms，而水解的TiO 2基滞后PSC的离子电荷响应时间为100.5 ms 。准稳态载流子传输的结果表明，J – V处存在动态滞后曲线可以用复杂的离子电子动力学来解释，这是由于电极极化引起的缓慢的离子电荷重新分布和空穴积累，从而导致电荷复合增加。这项研究表明，与基于TiO 2的PSC相比，基于SnO 2的PSC导致稳定的暗去极化过程，这与高性能平面SnO 2的PSC中的电荷传输动力学有关。
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