Origins of Photoluminescence Instabilities at Halide Perovskite/Organic Hole Transport Layer Interfaces

Zhaojian Xu, Daniel D. Astridge, Ross A. Kerner, Xinjue Zhong, Junnan Hu, Jisu Hong, Jesse A. Wisch, Kai Zhu, Joseph J. Berry, Antoine Kahn, Alan Sellinger, Barry P. Rand

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Metal halide perovskites are promising for optoelectronic device applications; however, their poor stability under solar illumination remains a primary concern. While the intrinsic photostability of isolated neat perovskite samples has been widely discussed, it is important to explore how charge transport layers─employed in most devices─impact photostability. Herein, we study the effect of organic hole transport layers (HTLs) on light-induced halide segregation and photoluminescence (PL) quenching at perovskite/organic HTL interfaces. By employing a series of organic HTLs, we demonstrate that the HTL's highest occupied molecular orbital energy dictates behavior; furthermore, we reveal the key role of halogen loss from the perovskite and subsequent permeation into organic HTLs, where it acts as a PL quencher at the interface and introduces additional mass transport pathways to facilitate halide phase separation. In doing so, we both reveal the microscopic mechanism of non-radiative recombination at perovskite/organic HTL interfaces and detail the chemical rationale for closely matching the perovskite/organic HTL energetics to maximize solar cell efficiency and stability.

Original languageEnglish (US)
Pages (from-to)11846-11858
Number of pages13
JournalJournal of the American Chemical Society
Volume145
Issue number21
DOIs
StatePublished - May 31 2023

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Biochemistry
  • Catalysis
  • Colloid and Surface Chemistry

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