4.8 Article

Moisture-Triggered Self-Healing Flexible Perovskite Photodetectors with Excellent Mechanical Stability

Journal

ADVANCED MATERIALS
Volume 33, Issue 16, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202100625

Keywords

flexible materials; moisture sensitivity; perovskites; photodetectors; self‐ healing

Funding

  1. National Natural Science Foundation of China [52025028, 51772197, 51872191, 52002258]
  2. 1000 Youth Talents Plan
  3. Natural Science Foundation of Jiangsu Province [BK20200877]
  4. Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions

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This study demonstrates a self-healing strategy using FAPbI(3) film and poly(vinyl alcohol) microscaffold to stabilize flexible perovskite devices and exhibit self-healing ability in high humidity environment.
Flexible devices are urgently required to meet the demands of next-generation optoelectronic devices and metal halide perovskites are proven to be suitable materials for realizing flexible photovoltaic devices. However, the tolerance to moisture corrosion and repeated mechanical bending remains a critical challenge for flexible perovskite devices. Herein, a self-healing formamidinium lead iodide (FAPbI(3)) film is fabricated to cure mechanical damage by absorbing moisture from the surrounding environment. A poly(vinyl alcohol) microscaffold is designed not only to stabilize the black phase of the FAPbI(3) film but also to endow it with self-healing ability in a humid environment. The photodetector based on a self-healing film exhibits a high responsivity of 11.3 A W-1 and recovers to over 90% of the initial responsivity after the self-healing process. This work provides an effective self-healing strategy to stabilize the operation of flexible perovskite devices under normal high-humidity environmental conditions.

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