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Open Access Publications from the University of California

Thermochromic halide perovskite solar cells.

  • Author(s): Lin, Jia
  • Lai, Minliang
  • Dou, Letian
  • Kley, Christopher S
  • Chen, Hong
  • Peng, Fei
  • Sun, Junliang
  • Lu, Dylan
  • Hawks, Steven A
  • Xie, Chenlu
  • Cui, Fan
  • Alivisatos, A Paul
  • Limmer, David T
  • Yang, Peidong
  • et al.

Smart photovoltaic windows represent a promising green technology featuring tunable transparency and electrical power generation under external stimuli to control the light transmission and manage the solar energy. Here, we demonstrate a thermochromic solar cell for smart photovoltaic window applications utilizing the structural phase transitions in inorganic halide perovskite caesium lead iodide/bromide. The solar cells undergo thermally-driven, moisture-mediated reversible transitions between a transparent non-perovskite phase (81.7% visible transparency) with low power output and a deeply coloured perovskite phase (35.4% visible transparency) with high power output. The inorganic perovskites exhibit tunable colours and transparencies, a peak device efficiency above 7%, and a phase transition temperature as low as 105 °C. We demonstrate excellent device stability over repeated phase transition cycles without colour fade or performance degradation. The photovoltaic windows showing both photoactivity and thermochromic features represent key stepping-stones for integration with buildings, automobiles, information displays, and potentially many other technologies.

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