Photoelectrical Dynamics Uplift in Perovskite Solar Cells by Atoms Thick 2D TiS2 Layer Passivation of TiO2 Nanograss Electron Transport Layer
Photoelectrical Dynamics Uplift in Perovskite Solar Cells by Atoms Thick 2D TiS2 Layer Passivation of TiO2 Nanograss Electron Transport Layer
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DOI：
10.1021/acsami.0c20137
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发表时间：
2021-01-07
影响因子：
9.5
通讯作者：
Zhan, Yiqiang
中科院分区：
文献类型：
--
作者：
Alias, Nabilah;Umar, Akrajas Ali;Zhan, Yiqiang
由于TiO 2电子传输层（ETL）的表面陷阱而导致的界面处的光电动力学的缺陷已经成为钙钛矿太阳能电池中的功率转换效率（PCE）劣化的关键因素。尽管其与大多数钙钛矿材料具有良好的能级对准，但由于亚晶格空位导致的大密度表面缺陷一直是器件中有效光伏过程的关键障碍。在这里，我们报告说，原子厚的二维TiS 2层生长在（001）面和单晶TiO 2纳米草（NG）ETL的表面上，有效地钝化了缺陷，提高了电荷提取能力，载流子迁移率，外量子效率和器件稳定性。这些特性允许钙钛矿太阳能电池（PSC）产生高达18.73%的PCE，短路电流密度（J（sc））、开路电压（V-oc）和填充因子（FF）值分别高达22.04 mA/cm（2）、1.13 V和0.752，比原始的基于TiO 2-NG的PSC提高3.3%。本方法将在控制钙钛矿太阳能电池中的光电动态缺陷方面得到广泛的应用。
A deficiency in the photoelectrical dynamics at the interface due to the surface traps of the TiO2 electron transport layer (ETL) has been the critical factor for the inferiority of the power conversion efficiency (PCE) in the perovskite solar cells. Despite its excellent energy level alignment with most perovskite materials, its large density of surface defect as a result of sub lattice vacancies has been the critical hurdle for an efficient photovoltaic process in the device. Here, we report that atoms thick 2D TiS2 layer grown on the surface of a (001) faceted and single-crystalline TiO2 nanograss (NG) ETL have effectively passivated the defects, boosting the charge extractability, carrier mobility, external quantum efficiency, and the device stability. These properties allow the perovskite solar cells (PSCs) to produce a PCE as high as 18.73% with short-circuit current density (J(sc)), open-circuit voltage (V-oc), and fill-factor (FF) values as high as 22.04 mA/cm(2), 1.13 V, and 0.752, respectively, a 3.3% improvement from the pristine TiO2-NG-based PSCs. The present approach should find an extensive application for controlling the photoelectrical dynamic deficiency in perovskite solar cells.