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Tuning Phase Purity in Chiral 2D Perovskites

Journal Article · · Advanced Optical Materials
 [1];  [2];  [3];  [4];  [2];  [5];  [2];  [5];  [6];  [2];  [6]
  1. University of Campinas (UNICAMP), Sao Paulo (Brazil); Technische Universität Dresden (Germany); Leibniz-Institute for Solid State and Materials Research Dresden (Germany)
  2. Technische Universität Dresden (Germany); Leibniz-Institute for Solid State and Materials Research Dresden (Germany)
  3. University of Campinas (UNICAMP), Sao Paulo (Brazil)
  4. Brazilian Synchrotron Light Laboratory (LNLS) Brazilian Center for Research in Energy and Materials (CNPEM) (Brazil)
  5. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  6. University of Campinas (UNICAMP) (Brazil)
The introduction of chiral organic spacers in low-dimensional metal-halide perovskites triggers chiroptical activity, which is appealing for spintronic applications. However, a comprehensive understanding of structure formation and the ability to control phase purity in such materials have yet to be developed. Herein, the impact of processing conditions on the phase purity, microstructure, and chiroptical properties of chiral 2D perovskites is explored. The anisotropic emergence of a 1D perovskite inside the 2D matrix and its dependence on the organic cation chirality, solvent, and thermal annealing conditions are shown. By controlling these parameters, the in-plane conductivity of the films is nearly doubled. Furthermore, it is demonstrated, for the first time, that solvent choice and the spatial configuration of the organic cation can have an impact on the residual lattice strain and the energetic disorder of the system. The fundamentals presented here can help to improve the film deposition methods for low-dimensional chiral perovskites, offering strategies to control phase purity.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
FAPESP; São Paulo Research Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2007185
Alternate ID(s):
OSTI ID: 2376157
Journal Information:
Advanced Optical Materials, Journal Name: Advanced Optical Materials Journal Issue: 2 Vol. 12; ISSN 2195-1071
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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