Deng Xiang, Qi Feng, Li Fengzhu, Wu Shengfan, Lin Francis R, Zhang Zhuomin, Guan Zhiqiang, Yang Zhengbao, Lee Chun-Sing, Jen Alex K-Y
Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, 999077, Hong Kong.
Department of Chemistry, City University of Hong Kong, Kowloon, 999077, Hong Kong.
Angew Chem Int Ed Engl. 2022 Jul 25;61(30):e202203088. doi: 10.1002/anie.202203088. Epub 2022 Jun 9.
Self-assembled monolayers (SAMs) have been widely employed as an effective way to modify interfaces of electronic/optoelectronic devices. To achieve a good control of the growth and molecular functionality of SAMs, we develop a co-assembled monolayer (co-SAM) for obtaining efficient hole selection and suppressed recombination at the hole-selective interface in inverted perovskite solar cells (PSCs). By engineering the position of methoxy substituents, an aligned energy level and favorable dipole moment can be obtained in our newly synthesized SAM, ((2,7-dimethoxy-9H-carbazol-9-yl) methyl) phosphonic acid (DC-PA). An alkyl ammonium containing SAM is co-assembled to further optimize the surface functionalization and interaction with perovskite layer on top. A champion device with an excellent power conversion efficiency (PCE) of 23.59 % and improved device stability are achieved. This work demonstrates the advantage of using co-SAM in improving performance and stability of PSCs.
自组装单分子层（SAMs）已被广泛用作修饰电子/光电器件界面的有效方法。为了实现对SAMs生长和分子功能的良好控制，我们开发了一种共组装单分子层（co-SAM），用于在倒置钙钛矿太阳能电池（PSC）的空穴选择性界面处实现高效的空穴选择和抑制复合。通过设计甲氧基取代基的位置，在我们新合成的SAM，即((2,7-二甲氧基-9H-咔唑-9-基)甲基)膦酸（DC-PA）中可以获得对齐的能级和有利的偶极矩。将含烷基铵的SAM共组装以进一步优化表面功能化以及与顶部钙钛矿层的相互作用。实现了具有23.59 %的优异功率转换效率（PCE）和改善的器件稳定性的冠军器件。这项工作证明了使用co-SAM在提高PSC性能和稳定性方面的优势。
