Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.172
Publication date: 16th December 2024
Electrochromic materials are garnering attention for applications in smart windows, displays, and augmented reality, enabling energy-efficient solutions by modulating light and heat transmission.[1]-[6] Hybrid organic-inorganic halide perovskites, renowned for their exceptional optoelectronic properties, have recently been explored for their electrochromic behavior. This study investigates perovskite precursor solutions as electrochromic materials, offering a promising alternative to conventional approaches that integrate perovskite solar cells with separate electrochromic layers. The perovskite precursor solution exhibits a voltage-dependent color change from yellow (0 V) to reddish-brown (2.5 V). The device achieves a 22% transmittance drop at 500 nm, with an average visible transmittance variation of ~30%, ideal for smart windows and display technologies. Raman and UV-Visible spectroscopy provides an insight into the mechanism and modifying A-site cations, B-site cations, or X-site anions in the perovskite structure further tunes the electrochromic properties. Demonstrations include a 4 cm² electrochromic window and a 24 cm² display incorporating a perovskite gel mixture, with response and recovery times of 7.65 s and 28.25 s, respectively. The system shows stable cyclic performance, a coloration efficiency of 1.084 cm²/C, and significant potential for energy-efficient applications. This study highlights the novel electrochromic behavior of perovskite solutions, eliminating the need for integrating solar cells with external electrochromic materials. The findings advance the development of scalable, sustainable devices for smart windows and displays, paving the way for innovative, energy-efficient technologies.
We acknowledge Science and Engineering Research Board (SERB) and Council for Scientific and Industrial Research (CSIR), Government of India for supporting the work. We would also like to thank SAIF, IIT Bombay for support with the characterization.
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