Dr. Edwin Tso’s research featured on the inside Front Cover of Advanced Functional Materials

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Dr. Edwin Tso’s group recently developed a hydrated MAPbI3−xClx thermochromic perovskite smart window, which demonstrates a smart and thermally responsive optical regulation ability. Notably, a low transition temperature, narrow transition hysteresis width, and short transition time are also achieved successfully, showing great potential for use in energy-efficient buildings. The results have been published (https://doi.org/10.1002/adfm.202010426) and featured on the inside Front Cover of Advanced Functional Materials (IF:16.836) (https://doi.org/10.1002/adfm.202170186).

Thermochromic smart windows are investigated as a novel energy-saving glazing technique in buildings because of their low cost and passive controllability of solar irradiance. Very recently, organic hybrid halide perovskites have been found to show thermochromism with good optical performance. However, these perovskites have shortcomings regarding their thermochromic performance (e.g. long transition time, high transition temperature and large transition hysteresis width). Dr. Tso’s group proposed a new thermochromic perovskite smart window (i.e. Hydrated MAPbI3-xClx) which undergoes a reversible transition between a transparent state and a dark reddish-brown tinted state with a high solar modulation ability, and excellent transition properties. This window also demonstrates the indoor air temperature reduction of 3.5 °C compared to using a quartz glass window when the window is fitted to a model house in Hong Kong. This research provides new insights into the development of next-generation energy-efficient windows for green buildings.

Dr. Tso is the corresponding author of this paper. Other CityU members are Sai Liu (PhD student), the first author, as well as co-authors Yu Wei Du (Research Assistant) and Hau Him Lee (Postdoc Fellowship), all of whom from SEE; and Prof. Kin Man Yu from the Department of Physics. Other co-authors include Dr. Shien-Ping Feng and Dr. Rui Cheng are from The University of Hong Kong.

Advanced Functional Materials