Passivation agent with dipole moment for surface modification towards efficient and stable perovskite solar cells

Ge Wang, Chen Wang, Yajun Gao, Shanpeng Wen, Roderick C.I. MacKenzie, Liuxing Guo, Wei Dong, Shengping Ruan

Research output: Contribution to journalArticlepeer-review

Abstract

Recently, there has been renewed interest in interface engineering as a means to further push the performance of perovskite solar cells closer to the Schockly-Queisser limit. Herein, for the first time we employ a multi-functional 4-chlorobenzoic acid to produce a self-assembled monolayer on a perovskite surface. With this interlayer we observe passivation of perovskite surface defects and a significant suppression of non-radiative charge recombination. Furthermore, at the surface of the interlayer we observe, charge dipoles which tune the energy level alignment, enabling a larger energetic driving force for hole extraction. The perovskite surface becomes more hydrophilic due to the presence of the interlayer. Consequently, we observe an improvement in open-circuit voltage from 1.08 to 1.16 V, a power conversion efficiency improvement from 18% to 21% and an improved stability under ambient conditions. Our work highlights the potential of SAMs to engineer the photo-electronic properties and stability of perovskite interfaces to achieve high-performance light harvesting devices.
Original languageEnglish (US)
Pages (from-to)55-61
Number of pages7
JournalJournal of Energy Chemistry
Volume64
DOIs
StatePublished - Apr 23 2021

ASJC Scopus subject areas

  • Electrochemistry
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Fuel Technology

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