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Interfacial Modification via a 1,4-Butanediamine-Based 2D Capping Layer for Perovskite Solar Cells with Enhanced Stability and Efficiency
ACS Applied Materials & Interfaces ( IF 9.5 ) Pub Date : 2021-12-27 , DOI: 10.1021/acsami.1c21036
Xiaojie Wang 1 , Yu Zhao 2 , Bin Li 2 , Xuefei Han 2 , Zuoming Jin 1 , Yuanqiang Wang 1 , Qinghong Zhang 2 , Yichuan Rui 1
Affiliation  

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 BDA2+ 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.

中文翻译:

通过 1,4-丁二胺基二维覆盖层对钙钛矿太阳能电池进行界面改性,提高稳定性和效率

有机-无机钙钛矿面临着易受氧气和水分以及位于表面和晶界的陷阱位点的影响。二维(2D)钙钛矿作为覆盖层的集成是提高三维(3D)底层的光伏效率和环境稳定性的有效途径。在这里,我们使用具有短链长度和二铵阳离子的 1,4-丁二碘化铵 (BDADI) 来构建 3D/2D 堆叠钙钛矿太阳能电池 (PSC)。BDA 2+的介绍可以通过形成 2D Dion-Jacobson (DJ) 相钙钛矿和有效抑制非辐射复合来钝化 3D 钙钛矿中的表面缺陷,从而延长载流子寿命。DJ 2D 覆盖层还可以调节能级排列,从而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了提高。因此,3D/2D 堆叠 PSC 的能量转换效率为 20.32%,同时具有增强的长期稳定性。
更新日期:2021-12-27
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