4.8 Article

Full-Dimensional Grain Boundary Stress Release for Flexible Perovskite Indoor Photovoltaics

Journal

ADVANCED MATERIALS
Volume 34, Issue 16, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202200320

Keywords

borax; flexible photovoltaics; grain boundary; mechanical stability; perovskite photovoltaics

Funding

  1. National Natural Science Foundation of China [62075148, 52073197]
  2. Natural Science Foundation of Jiangsu Province [BK20201413, BK20211314]
  3. Suzhou Key Laboratory of Functional Nano & Soft Materials, Collaborative Innovation Center of Suzhou Nano Science Technology
  4. 111 Project
  5. Joint International Research Laboratory of Carbon-Based Functional Materials and Devices
  6. Soochow University Tang Scholar

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This article discusses a full-dimensional grain boundary stress release strategy for flexible perovskite indoor photovoltaics. By using borax as a 3D crosslinking agent, the mechanical and phase stabilities of the perovskite films are improved. The fabricated devices show high conversion efficiencies under indoor conditions.
Perovskite photovoltaics are strong potential candidates to drive low-power off-grid electronics for indoor applications. Compared with rigid devices, flexible perovskite devices can provide a more suitable surface for indoor small electronic devices, enabling them have a broader indoor application prospect. However, the mechanical stability of flexible perovskite photovoltaics is an urgent issue solved. Herein, a kind of 3D crosslinking agent named borax is selected to carry out grain boundary penetration treatment on perovskite film to realize full-dimensional stress release. This strategy improves the mechanical and phase stabilities of perovskite films subjected to external forces or large temperature changes. The fabricated perovskite photovoltaics deliver a champion power conversion efficiency (PCE) of 21.63% under AM 1.5G illumination, which is the highest one to date. The merit of low trap states under weak light makes the devices present a superior indoor PCE of 31.85% under 1062 lux (LED, 2956 K), which is currently the best flexible perovskite indoor photovoltaic device. This work provides a full-dimensional grain boundary stress release strategy for highly stable flexible perovskite indoor photovoltaics.

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