Pei Mingzhu, Dong Qingshun, Wang Minhuan, Wang Yudi, Ma Hongru, Liu Jing, Wang Ruiting, Bian Jiming, Shi Yantao
State Key Laboratory of Fine Chemicals, Department of Chemistry, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, China.
ACS Appl Mater Interfaces. 2022 Apr 13;14(14):16920-16927. doi: 10.1021/acsami.2c02250. Epub 2022 Mar 30.
Interfacial passivation engineering plays a crucial role in the explosive development of perovskite solar cells (PSCs). However, previous studies on passivation layers mainly focused on the defect-passivation mechanism rather than the interfacial charge transport efficiency. Here, by precisely tuning the interplanar spacing of the ammonium iodide passivation layer, we elucidate the promoting effect of the reduced interplanar spacing of the passivation layer on the photogenerated hole tunneling efficiency at the interface of the hole transport layer and perovskite. Compared with the commonly used phenethylammonium iodide passivation layer with a wider interplanar spacing, 2-chlorobenzylammonium iodide with a narrower interplanar spacing can help break through the thickness limitation of the passivation layer, thus showing a better comprehensive passivation effect. Therefore, we demonstrate photovoltaic devices with an enhanced fill factor (FF) and open-circuit voltage (), which yield a high power conversion efficiency (PCE) of up to 23.1%. We thus identify an efficient scheme to achieve optimal passivation conditions for high-performance PSCs.
界面钝化工程在钙钛矿太阳能电池（PSC）的迅猛发展中起着至关重要的作用。然而，以往关于钝化层的研究主要集中在缺陷钝化机制上，而非界面电荷传输效率。在此，通过精确调节碘化铵钝化层的面间距，我们阐明了钝化层面间距减小对空穴传输层与钙钛矿界面处光生空穴隧穿效率的促进作用。与面间距较宽的常用碘化苯乙铵钝化层相比，面间距较窄的2-氯苄基碘化铵有助于突破钝化层的厚度限制，从而表现出更好的综合钝化效果。因此，我们展示了具有提高的填充因子（FF）和开路电压（）的光伏器件，其功率转换效率（PCE）高达23.1%。由此，我们确定了一种实现高性能PSC最佳钝化条件的有效方案。
