Journal Article

PUBDB-2026-01822

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Halide Segregation in Wide-Bandgap Quasi-2D Perovskites under Rapid Thermal Cycling

Sun, K. (Corresponding author)Extern* ; Fong, K. L. ; Ci, X.Extern* ; Jiang, X.Extern* ; Wegener, S. A.Extern* ; Liang, Y.Extern* ; Li, Z.Extern* ; Schwartzkopf, M.DESY* ; Koyiloth Vayalil, S.DESY* ; Roth, S. V.XFEL.EU*DESY* ; Mueller-Buschbaum, P. (Corresponding author)Extern*

2026
American Chemical Society Washington, DC

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Please use a persistent id in citations: doi:10.1021/acsenergylett.6c00094  doi:10.3204/PUBDB-2026-01822

Abstract: Wide-bandgap (WBG) perovskites are susceptible to ion migration and phase separation under external stressors. Reduced-dimensional perovskites (RDPs) have emerged as alternatives to 3D perovskites for improving stability. However, the influence of spacer cations on the thermal cycling stability of WBG RDPs remains poorly understood. Here, we investigate the effect of two representative organic spacers, butylammonium (BA) and 1,4-phenylenedimethylammonium (PDMA), on the stability of WBG RDPs (n = 4, ∼1.75 eV) under light illumination and thermal cycling using in situ grazing-incidence X-ray wide-angle scattering (GIWAXS) and photoluminescence (PL). In situ GIWAXS and PL reveal that RDPs with BA+ undergo phase separation and pronounced structural degradation under combined stress, particularly along the in-plane direction, whereas RDPs with PDMA2+ demonstrate better stability. These results indicate that bulky organic cations influence the thermal and structural stabilities of WBG RDPs, providing design guidelines for stable perovskite absorbers in tandem solar cells.

Note: cc-by

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. PETRA-D (FS-PETRA-D)
3. Sustainable Materials (FS-SMA)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. DFG project G:(GEPRIS)390776260 - EXC 2089: e-conversion 2.0 (390776260) (390776260)

Experiment(s):

1. PETRA Beamline P03 (PETRA III)

Appears in the scientific report 2026

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 20 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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