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Local halide heterogeneity drives surface wrinkling in mixed-halide wide-bandgap perovskites

Journal Article · · Nature Communications
 [1];  [2];  [3];  [4];  [5];  [2];  [6];  [7];  [8];  [2];  [2];  [3];  [3];  [9];  [4];  [10];  [2];  [11]
  1. Eindhoven University of Technology (Netherlands); Georgia Institute of Technology, Atlanta, GA (United States)
  2. Eindhoven University of Technology (Netherlands)
  3. University of Washington, Seattle, WA (United States)
  4. Georgia Institute of Technology, Atlanta, GA (United States)
  5. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  6. Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  7. Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  8. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  9. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry
  10. University of Washington, Seattle, WA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  11. Eindhoven University of Technology (Netherlands); Dutch Institute for Fundamental Energy Research (DIFFER), Eindhoven (Netherlands)
Compositional heterogeneity in wide-bandgap (1.8 - 2.1 eV) mixed-halide perovskites is a key bottleneck in the processing of high-quality solution-processed thin films and prevents their application in efficient multijunction solar cells. Notably, mixed-cation (formamidinium-methylammonium) wide-bandgap perovskite films are prone to form micrometer-scale wrinkles which can interfere with the smooth surfaces ideal for multijunction devices. Here, we study the formation dynamics of wrinkled mixed-halide perovskite films and its impact on the local composition and optoelectronic properties. We use in situ X-ray scattering during perovskite film formation to show that crystallization of bromide-rich perovskites precedes that of mixed-halide phases in wrinkled films cast using an antisolvent-based process. Using nanoscopic X­-ray fluorescence and hyperspectral photoluminescence imaging, we also demonstrate the formation of iodide- and bromide-rich phases in the wrinkled domains. This intrinsic spatial halide segregation results in an increased local bandgap variation and Urbach energy. Morphological disorder and compositional heterogeneity also aggravate the formation of sub-bandgap electronic defects, reducing photostability and accelerating light-induced segregation of iodide and bromide ions in thin films and solar cells.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-05CH11231; AC02-06CH11357; AC05-76RL01830; SC0012704
OSTI ID:
2538435
Alternate ID(s):
OSTI ID: 2549236
OSTI ID: 2566026
Report Number(s):
BNL--227980-2025-JAAM; PNNL-SA--197271; ark:/13030/qt8dt4644d
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 16; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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