Li Dongyang, Kong Weiguang, Zhang Haichao, Wang Deng, Li Wang, Liu Changwen, Chen Hong, Song Weidong, Gao Fangliang, Amini Abbas, Xu Baomin, Li Shuti, Cheng Chun
Department of Materials Science and Engineering, Southern University of Science and Technology (SUSTech), Shenzhen 518055, P. R. China.
Laboratory of Nanophotonic Functional Materials and Devices, Institute of Semiconductor, South China Normal University, Guangzhou 510631, P. R. China.
ACS Appl Mater Interfaces. 2020 Apr 29;12(17):20103-20109. doi: 10.1021/acsami.0c02837. Epub 2020 Apr 14.
Inverted perovskite solar cells (PSCs) with a C framework are known for their common drawback of low power conversion efficiency (PCE) of <20% because of nonradiative recombination and inefficient charge transport at their perovskite interfaces. Here, we report an ultrathin [6,6]-phenyl-C-butyric acid methyl ester (PCBM) as a cap layer on perovskite films to overcome this issue. Such a functional cap layer efficiently passivates trap states and establishes a gradient energy level alignment onto perovskite, facilitating the efficient charge transfer and extraction. The as-fabricated inverted PSCs capped with such ultrathin PCBM exhibit a record PCE of 20.07%. After the storage under a N atmosphere for more than 500 h, the PCE of PSCs retains over 85% of its initial level. Our work provides an effective method to upgrade inverted PSCs with the C framework with improved efficiency and stability.
具有C结构的倒置钙钛矿太阳能电池（PSC）因其在钙钛矿界面处存在非辐射复合和电荷传输效率低下的问题，普遍存在功率转换效率（PCE）低于20%的缺点。在此，我们报道了一种超薄的[6,6]-苯基-C-丁酸甲酯（PCBM）作为钙钛矿薄膜上的盖帽层来克服这一问题。这种功能性盖帽层有效地钝化了陷阱态，并在钙钛矿上建立了梯度能级排列，促进了电荷的有效转移和提取。用这种超薄PCBM封装的倒置PSC表现出创纪录的20.07%的PCE。在氮气气氛下储存超过500小时后，PSC的PCE保持在其初始水平的85%以上。我们的工作提供了一种有效的方法来提升具有C结构的倒置PSC的效率和稳定性。
