Abstract
In situ isothermal XRD and microscopy are used to quantify the time- and temperature-dependent thin-film phase transitions of CsPbI 3 from its optoelectronically-desirable black phases to its yellow non-perovskite δ-CsPbI 3 phase.
Funding Information
  • National Science Foundation Graduate Research Fellowship Program (DGE-2039656)
  • Division of Materials Research (DMR-2011750)
  • Solar Energy Technologies Office (DE-EE0010503)

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