Wang Xiaojie, Zhao Yu, Li Bin, Han Xuefei, Jin Zuoming, Wang Yuanqiang, Zhang Qinghong, Rui Yichuan
College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, P. R. China.
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, P. R. China.
ACS Appl Mater Interfaces. 2021 Dec 27. doi: 10.1021/acsami.1c21036.
Organic-inorganic perovskites face the issues of being vulnerable to oxygen and moisture and the trap sites located at the surface and grain boundaries. Integration of two-dimensional (2D) perovskites as a capping layer is an effective route to enhance both photovoltaic efficiency and environmental stability of the three-dimensional (3D) underlayer. Here, we employ 1,4-butanediammonium diiodide (BDADI), which has a short chain length and diammonium cations, to construct a 3D/2D stacking perovskite solar cells (PSCs). The introduction of BDA could passivate surface defects in 3D perovskites by forming 2D Dion-Jacobson (DJ) phase perovskites and effectively suppressing nonradiative recombination, thus resulting in a longer carrier lifetime. The DJ 2D capping layer also regulate the energy level arrangement, enabling a better charge extraction and transport process. In addition, the water-resistance ability of 3D perovskite gets improved because of the hydrophobic characteristic of 1,4-butanediammonium cations. Consequently, the 3D/2D stacking PSCs yield an energy conversion efficiency of 20.32% in company with the enhanced long-term stability.
有机-无机钙钛矿面临着易受氧气和水分影响以及存在位于表面和晶界处的陷阱态等问题。整合二维（2D）钙钛矿作为覆盖层是提高三维（3D）下层光伏效率和环境稳定性的有效途径。在此，我们采用具有短链长度和二铵阳离子的1,4-丁二铵二碘化物（BDADI）来构建3D/2D堆叠钙钛矿太阳能电池（PSC）。BDA的引入可通过形成二维狄翁-雅各布森（DJ）相钙钛矿来钝化3D钙钛矿中的表面缺陷，并有效抑制非辐射复合，从而导致更长的载流子寿命。DJ二维覆盖层还能调节能级排列，实现更好的电荷提取和传输过程。此外，由于1,4-丁二铵阳离子的疏水特性，3D钙钛矿的防水能力得到提高。因此，3D/2D堆叠PSC的能量转换效率达到20.32%，同时长期稳定性也得到增强。
