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Title: Atmospheric Exposure Triggers Light-Induced Degradation in 2D Lead-Halide Perovskites

Journal Article · · ACS Energy Letters
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4];  [5];  [2]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [5]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [2]
  1. AMOLF, Amsterdam (The Netherlands); University of Cambridge (United Kingdom)
  2. AMOLF, Amsterdam (The Netherlands)
  3. Max Planck Institute for Polymer Research, Mainz (Germany)
  4. AMOLF, Amsterdam (The Netherlands); University of Amsterdam (The Netherlands)
  5. University of Amsterdam (The Netherlands)
  6. Georgia Institute of Technology, Atlanta, GA (United States)

Quasi-2D perovskites have been pivotal in recent efforts to stabilize perovskite solar cells. Despite the stability boost provided when these materials are introduced in perovskite solar cells, little is known about the intrinsic light and environmental stability of quasi-2D perovskites. In this study, we characterize the photostability of exfoliated quasi-2D perovskite single crystals in air using photoluminescence, infrared, X-ray fluorescence, and energydispersive X-ray spectroscopy. Photoexcitation leads to severe material loss with oxygen as a prerequisite for material breakdown. The effect can be traced to the formation of reactive oxygen species, as demonstrated by increases in the photostability under oxygen-free conditions. We show the effect of combined passivation steps, showcasing the stability enhancement offered by 2D-capping layers in combination with an oxygen-free atmosphere. Our results reveal that the stability of illuminated quasi-2D perovskites depends critically on oxygen exposure, highlighting the importance of oxygen-blocking passivation strategies for stable 2D perovskite-based devices.

Research Organization:
AMOLF, Amsterdam (The Netherlands)
Sponsoring Organization:
EPSRC International Centre to Centre; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2476748
Journal Information:
ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 12 Vol. 9; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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