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Influence of Methylammonium Chloride on Wide-Bandgap Halide Perovskites Films for Solar Cells

Journal Article · · Advanced Functional Materials
 [1];  [2];  [3];  [4];  [5];  [6];  [2];  [6];  [2];  [5]
  1. University of Campinas (UNICAMP), Sao Paulo (Brazil); Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP (Brazil). Brazilian Synchrotron Light Laboratory (LNLS)
  2. Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP (Brazil). Brazilian Synchrotron Light Laboratory (LNLS)
  3. Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP (Brazil). Brazilian Synchrotron Light Laboratory (LNLS); University of Campinas (UNICAMP), Sao Paulo (Brazil)
  4. University of Campinas (UNICAMP), Sao Paulo (Brazil); Center for Information Technology Renato Archer (CTI Renato Archer), Campinas, SP (Brazil)
  5. University of Campinas (UNICAMP), Sao Paulo (Brazil)
  6. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry
Wide-bandgap perovskites are of paramount importance as the photoactive layer of the top cell in high-efficiency tandem solar cells. Comparably high Br contents are required to widen the perovskite bandgap. However, the increase in Br content causes heterogeneous halide distribution and photoinstability. Here, in this study, the positive effect of the additive methylammonium chloride (MACl) on the optical and electronic properties of Br-rich perovskite, deposited using N-methyl-2-pyrrolidone (NMP) as co-solvent and the gas quenching method, is investigated. Simultaneous in situ grazing-incidence wide-angle X-ray scattering and photoluminescence spectroscopy are used to track the evolution of the structural and optoelectronic properties of the perovskites with different amounts of Br and MACl during the spin-coating and thermal annealing steps. The formation mechanism is elucidated in the presence of MACl. It is observed that chloride ions inhibit the intermediate phases, favoring the formation of a perovskite phase with higher crystallinity. Nano X-ray fluorescence mapping recognizes Br-richer and poorer nanometric domains, whose average sizes reduce for samples with MACl. In conclusion, it is demonstrated that adding MACl affects the formation of wide-bandgap perovskites via destabilization of the intermediate phases and acts on the homogenization of the halide distribution, leading to improved solar cell performances.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
German Research Foundation (DFG); Sao Paulo Research Foundation (FAPESP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2562124
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 50 Vol. 34; ISSN 1616-301X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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