Qi Cao, Tianyue Wang, Xingyu Pu, Xilai He, Mingchao Xiao, Hui Chen, Lvchao Zhuang, Qi Wei, Hok‐Leung Loi, Peng Guo, Bochun Kang, Guangpeng Feng, Jing Zhuang, Guitao Feng, Xuanhua Li, Feng Yan

Co‐self‐assembled Monolayers Modified NiOx for Stable Inverted Perovskite Solar Cells

  • Mechanical Engineering
  • Mechanics of Materials
  • General Materials Science

Abstract[4‐(3,6‐dimethyl‐9H‐carbazol‐9yl)butyl]phosphonic acid (Me‐4PACz) self‐assembled molecules (SAM) are an effective method to solve the problem of the buried interface of NiOx in inverted perovskite solar cells (PSCs). However, the Me‐4PACz end group (carbazole core) cannot forcefully passivate defects at the bottom of the perovskite film. Here, we employ a Co‐SAM strategy to modify the buried interface of PSCs. Me‐4PACz is doped with phosphorylcholine chloride (PC) to form a Co‐SAM to improve the monolayer coverage and reduce leakage current. The phosphate group and chloride ions (Cl) in PC can inhibit NiOx surface defects. Meantime, the quaternary ammonium ions and Cl in PC can fill organic cations and halogen vacancies in the perovskite film to enable defects passivation. Moreover, Co‐SAM can promote the growth of perovskite crystals, collaboratively solve the problem of buried defects, suppress non‐radiative recombination, accelerate carrier transmission, and relieve the residual stress of the perovskite film. Consequently, the Co‐SAM modified devices show power conversion efficiencies as high as 25.09% as well as excellent device stability with 93% initial efficiency after 1000‐hours of operation under one‐sun illumination. This work demonstrates the novel approach for enhancing the performance and stability of PSCs by modifying Co‐SAM on NiOx.This article is protected by copyright. All rights reserved

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