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Title: Self-Passivation of 2D Ruddlesden–Popper Perovskite by Polytypic Surface PbI 2 Encapsulation

Journal Article · · Nano Letters

Two-dimensional Ruddlesden–Popper (2D RP) halide perovskites, C2MAn–1PbnI3n+1 (C = bulky ammonium cation; MA = methylammonium) with low n-members (n < 5), have been garnering sensational attention for photovoltaic and optoelectronic applications because of the long carrier diffusion lengths, long-term stability, and tunable bandgap. Yet, the surface modification of 2D RP under kinetic particle irradiation, such as light or electron irradiation, is ambiguous, even though it is imperative to elucidate long-stabilized conversion efficiency. Herein, we present molecular-scale observations of dynamic surface reconstruction of BA2MA2Pb3I10 (n = 3) 2D RP induced by the electron beam. The surface dynamics reveal lateral growth of polytypic PbI2 with 3R, 4H, and 2H structures at the edge and surface of the 2D perovskite, accompanied by simultaneous annihilation at the other edges. Local radiolysis occurs dominantly by the internal energy increase of electron momentum transfer, which triggers a sequential layer-by-layer degradation into PbI2. Here, in situ observation of the polytypic PbI2 growth at the whole surface and edges of 2D RP under electron irradiation elucidates how the outer PbI2 self-passivation can protect inner 2D RP, causing longer operando stability.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); Northwestern University, International Institute for Nanotechnology (IIN); W.M. Keck Foundation; State of Illinois; US Department of the Navy, Office of Naval Research (ONR); Air Force Research Laboratory (AFRL); USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1577089
Journal Information:
Nano Letters, Vol. 19, Issue 9; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Cited By (1)

Electron‐Beam‐Related Studies of Halide Perovskites: Challenges and Opportunities journal February 2020