Full-frame and high-contrast smart windows from halide-exchanged perovskites

• DOI: 10.1038/s41467-021-23701-z
• Publication Date: 2021-06-07T10:20:51Z
• Authors: You Liu; Jungan Wang; Fangfang Wang; Zhengchun Cheng; Yinyu Fang; Qing Chang; Jixin Zhu; Lin Wang; Jianpu Wang; Wei Huang; Tianshi Qin
• Keywords: Glazing; Contrast ratio

Abstract Window glazing plays an essential role to modulate indoor light and heat transmission, which is a prospect save the energy cost in buildings. The latest photovoltachromic technology has been regarded as one of most ideal solutions, however, achieve full-frame size (100% active area) high-contrast ratio (>30% variable visible wavelength) for smart window applicability still challenge. Here we report device combining full-transparent perovskite photovoltaic ion-gel based electrochromic components vertical tandem architecture without any intermediated electrode. Most importantly, by accurately adjusting halide-exchanging period, this module can realize high pristine transmittance up 76%. Moreover, it possesses excellent colour-rendering index 96, wide contrast (>30%) on average (400-780 nm), self-adaptable adjustment control brightness temperature automatically depending different solar irradiances.