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Revealing Electrical‐Poling‐Induced Polarization Potential in Hybrid Perovskite Photodetectors
Advanced Materials ( IF 27.4 ) Pub Date : 2020-10-21 , DOI: 10.1002/adma.202005481
Chuntao Lan 1, 2 , Haiyang Zou 1 , Longfei Wang 1 , Meng Zhang 1 , Shuang Pan 1 , Ying Ma 2 , Yiping Qiu 2 , Zhong Lin Wang 1 , Zhiqun Lin 1
Affiliation  

Despite recent rapid advances in metal halide perovskites for use in optoelectronics, the fundamental understanding of the electrical‐poling‐induced ion migration, accounting for many unusual attributes and thus performance in perovskite‐based devices, remain comparatively elusive. Herein, the electrical‐poling‐promoted polarization potential is reported for rendering hybrid organic–inorganic perovskite photodetectors with high photocurrent and fast response time, displaying a tenfold enhancement in the photocurrent and a twofold decrease in the response time after an external electric field poling. First, a robust meniscus‐assisted solution‐printing strategy is employed to facilitate the oriented perovskite crystals over a large area. Subsequently, the electrical poling invokes the ion migration within perovskite crystals, thus inducing a polarization potential, as substantiated by the surface potential change assessed by Kelvin probe force microscopy. Such electrical‐poling‐induced polarization potential is responsible for the markedly enhanced photocurrent and largely shortened response time. This work presents new insights into the electrical‐poling‐triggered ion migration and, in turn, polarization potential as well as into the implication of the latter for optoelectronic devices with greater performance. As such, the utilization of ion‐migration‐produced polarization potential may represent an important endeavor toward a wide range of high‐performance perovskite‐based photodetectors, solar cells, transistors, scintillators, etc.

中文翻译:

揭示混合钙钛矿光电探测器中电极化引起的极化电势

尽管近来用于光电子学的金属卤化物钙钛矿取得了飞速发展,但对电极化引起的离子迁移的基本理解却难以捉摸,这说明了钙钛矿基器件的许多不寻常属性以及性能。在此,据报道电极化增强的极化电势使有机-无机钙钛矿混合光电探测器具有高光电流和快速响应时间,在外部电场极化后,光电流增强了十倍,响应时间减少了两倍。首先,采用鲁棒的弯月面辅助溶液打印策略来促进大范围定向钙钛矿晶体的形成。随后,电极化会引起钙钛矿晶体内的离子迁移,如开尔文探针力显微镜所评估的表面电势变化所证实的那样,因此产生了极化电势。这种由电极化引起的极化电势可显着提高光电流并大大缩短响应时间。这项工作为电极化触发的离子迁移以及极化电势以及后者对更高性能的光电器件的影响提供了新的见解。因此,利用离子迁移产生的极化电势可能代表着对各种高性能基于钙钛矿的光电探测器,太阳能电池,晶体管,闪烁体等的重要努力。这种由电极化引起的极化电势可显着提高光电流并大大缩短响应时间。这项工作为电极化触发的离子迁移以及极化电势以及后者对更高性能的光电器件的影响提供了新的见解。因此,利用离子迁移产生的极化电势可能代表着对各种高性能基于钙钛矿的光电探测器,太阳能电池,晶体管,闪烁体等的重要努力。这种由电极化引起的极化电势可显着提高光电流并大大缩短响应时间。这项工作为电极化触发的离子迁移以及极化电势以及后者对更高性能的光电器件的影响提供了新的见解。因此,利用离子迁移产生的极化电势可能代表着对各种高性能基于钙钛矿的光电探测器,太阳能电池,晶体管,闪烁体等的重要努力。极化电位以及后者对更高性能的光电器件的影响。因此,利用离子迁移产生的极化电势可能代表着对各种高性能基于钙钛矿的光电探测器,太阳能电池,晶体管,闪烁体等的重要努力。极化电位以及后者对更高性能的光电器件的影响。因此,利用离子迁移产生的极化电势可能代表着对各种高性能基于钙钛矿的光电探测器,太阳能电池,晶体管,闪烁体等的重要努力。
更新日期:2020-11-25
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