Thermochromic Halide Perovksite Windows with Ideal Transition Temperatures

Bryan A. Rosales, Janghyun Kim, Vincent M. Wheeler, Laura E. Crowe, Kevin J. Prince, Mirzo Mirzokarimov, Tom Daligault, Adam Duell, Colin A. Wolden, Laura T. Schelhas, Lance M. Wheeler

Research output: Contribution to journalArticlepeer-review

17 Scopus Citations


Urban centers across the globe are responsible for a significant fraction of energy consumption and CO2 emission. As urban centers continue to grow, the popularity of glass as cladding material in urban buildings is an alarming trend. Dynamic windows reduce heating and cooling loads in buildings by passive heating in cold seasons and mitigating solar heat gain in hot seasons. Here, reduced energy consumption in highly glazed buildings in a mesoscopic building energy model is demonstrated when thermochromic windows are employed. Savings are realized across eight disparate climate zones of the United States. The model is used to determine ideal critical transition temperatures of 20–27.5 °C for thermochromic windows based on metal halide perovskite materials. Ideal transition temperatures are realized experimentally in composite metal halide perovskite films composed of perovskite crystals and an adjacent reservoir phase. The transition temperature is controlled by cointercalating methanol, instead of water, with methylammonium iodide and tailoring the hydrogen-bonding chemistry of the reservoir phase. Thermochromic windows based on metal halide perovskites represent a clear opportunity to mitigate the effects of energy-hungry buildings.

Original languageAmerican English
Article number2203331
Number of pages12
JournalAdvanced Energy Materials
Issue number12
StatePublished - 2023

Bibliographical note

See NREL/JA-5900-81170 for preprint

NREL Publication Number

  • NREL/JA-5900-85376


  • energy-efficient buildings
  • hydrogen bonding
  • perovskites
  • polymers
  • smart windows
  • switchable
  • thermochromism


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