Study on the halide effect of MA4PbX6·2H2O hybrid perovskites – From thermochromic properties to practical deployment for smart windows

Two-dimensional lead-free mixed-halide perovskites with tunable optical properties

“…1,2 Thanks to their unique optical and electronic properties, lead-based halide perovskites are the most investigated. 3 However, the environmental instability and the presence of hazardous lead have hindered their wide-scale commercialization. Therefore, considerable attention has been focused on lead-free alternatives with enhanced stability.…”

Optical Memory, Switching, and Neuromorphic Functionality in Metal Halide Perovskite Materials and Devices

“…Halder et al first demonstrated reversible reaction for thermochromism in MAPbI 3 solar cells, [183] and there have been many reports since with similar chemistries and application to thermochromic windows. [78,80,184,185,186] Reversible cointercalation of hydrated MAI was also recently shown to occur in layered 2D analogs of MAPbI 3 and show robust cycling behavior. [185] Similar to methylamine demonstrations, water vapor can be sealed into a vessel with the perovskite composite film to produce a closed system that may be switched with heat as the sole stimulus.…”

“…These low-energy transformations are the bane of photovoltaics researchers, [76] who seek to maintain materials properties over long lifetime and in harsh conditions. However, there is building excitement around leveraging the transformations for new technologies, [77] including thermochromic windows [78][79][80] and switchable photovoltaic devices. [25,81] Such transformations are also promising, but largely unexplored, for optical memory or neuromorphic functionality.…”

Thermochromic Energy Efficient Windows: Fundamentals, Recent Advances, and Perspectives

“…However, its long-term cycle performance needs further study. Similarly, Du et al studied MA 4 PbI 6– x – y Br x Cl y ·2H 2 O perovskites by incorporating Br and Cl, which can reduce the hysteresis width by approximately 10–15 °C and lower the transition time to approximately 60–80 s while maintaining a comparable solar energy modulation ability above 15%. The thermal-regulating test shows that MA 4 PbI 5 Br 1 ·2H 2 O can reduce the indoor temperature by up to 3.8 °C (Figure ).…”