Multifunctional Conjugated Ligand Engineering for Stable and Efficient Perovskite Solar Cells

Ke Ma, Harindi R. Atapattu, Qiuchen Zhao, Yao Gao, Blake P. Finkenauer, Kang Wang, Ke Chen, So Min Park, Aidan H. Coffey, Chenhui Zhu, Libai Huang, Kenneth R. Graham, Jianguo Mei, Letian Dou

Research output: Contribution to journalArticlepeer-review

146 Scopus citations

Abstract

Surface passivation is an effective way to boost the efficiency and stability of perovskite solar cells (PSCs). However, a key challenge faced by most of the passivation strategies is reducing the interface charge recombination without imposing energy barriers to charge extraction. Here, a novel multifunctional semiconducting organic ammonium cationic interface modifier inserted between the light-harvesting perovskite film and the hole-transporting layer is reported. It is shown that the conjugated cations can directly extract holes from perovskite efficiently, and simultaneously reduce interface non-radiative recombination. Together with improved energy level alignment and the stabilized interface in the device, a triple-cation mixed-halide medium-bandgap PSC with an excellent power conversion efficiency of 22.06% (improved from 19.94%) and suppressed ion migration and halide phase segregation, which lead to a long-term operational stability, is demonstrated. This strategy provides a new practical method of interface engineering in PSCs toward improved efficiency and stability.

Original languageEnglish
Article number2100791
JournalAdvanced Materials
Volume33
Issue number32
DOIs
StatePublished - Aug 12 2021

Bibliographical note

Publisher Copyright:
© 2021 Wiley-VCH GmbH

Keywords

  • charge transfer
  • organic semiconductors
  • perovskite solar cells
  • stability
  • surface passivation

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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