Halogen-halogen bonds enable improved long-term operational stability of mixed-halide perovskite photovoltaics

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Xinliang Fu
  • Tingwei He
  • Shifu Zhang
  • Xiaojuan Lei
  • Yuanzhi Jiang
  • Di Wang
  • Pingchuan Sun
  • Dongbing Zhao
  • Xiaofang Li
  • Mei Wang
  • Mingjian Yuan

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)3131-3143
Journal / PublicationChem
Volume7
Issue number11
Online published3 Sep 2021
Publication statusPublished - 11 Nov 2021

Abstract

Mixed-halide perovskite provides band-gap tunability, which is essential for tandem solar cell application. However, ion migration inducing phase segregation seriously affects the device's long-term operational stability. The issue thus represents an important challenge for the whole perovskite community and urgently needs effective solutions. We showcase here for the first time that a strong chemical interaction, a halogen-halogen bond, is introduced at the phase interface to suppress the ion migration by increasing the corresponding activation energy. Various characterizations have proved that halogen-halogen bonds form between 2D and 3D phases, which do suppress the halide segregation. As expected, the encapsulated device retains 90% of initial power conversion efficiency (PCE) after maximum power point (MPP) tracking for ∼500 h under continuous simulated 1-sun illumination (AM 1.5) in ambient conditions, representing one of the most stable, wide-band-gap, mixed-halide perovskite photovoltaics reported so far.

Research Area(s)

  • halogen-halogen bonds, ion migration, long-term stability, photovoltaic, wide-bandgap perovskite

Citation Format(s)

Halogen-halogen bonds enable improved long-term operational stability of mixed-halide perovskite photovoltaics. / Fu, Xinliang; He, Tingwei; Zhang, Shifu; Lei, Xiaojuan; Jiang, Yuanzhi; Wang, Di; Sun, Pingchuan; Zhao, Dongbing; Hsu, Hsien-Yi; Li, Xiaofang; Wang, Mei; Yuan, Mingjian.

In: Chem, Vol. 7, No. 11, 11.11.2021, p. 3131-3143.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review