Jia’s paper in Nat Mater

Our collaborative work “thermochromic perovskite solar cells” has been published in Nature Materials. Smart photovoltaic windows represent a promising green technology featuring tunable transparency and electrical power generation under external stimuli to control the light transmission and manage the solar energy. Here, we demonstrate a thermochromic solar cell for smart photovoltaic window applications utilizing the structural phase transitions in inorganic halide perovskite caesium lead iodide/bromide. The solar cells undergo thermally-driven, moisture-mediated reversible transitions between a transparent non-perovskite phase (81.7% visible transparency) with low power output and a deeply coloured perovskite phase (35.4% visible transparency) with high power output. The photovoltaic windows showing both photoactivity and thermochromic features represent key stepping-stones for integration with buildings, automobiles, information displays, and potentially many other technologies.

Review paper published

Our collaborative review article about semiconductor alloy nanomaterials is published in Nature Reviews Materials. Over the past decade there has been tremendous progress in the development of nanoscale semiconductor materials with a wide range of bandgaps, obtained by alloying different individual semiconductors. One important common feature of these materials is that their nanoscale dimensions result in a large tolerance to lattice mismatches within a monolithic structure of varying compositions or between substrate and target material, which allows the achievement of almost arbitrarily controlled variations of the alloy composition. As a result, the bandgaps of these alloys can be tuned widely without the detrimental defects that are often unavoidable in bulk materials, which have a much more limited tolerance to lattice mismatches. This class of nanomaterials could have a far-reaching impact on a wide range of photonic applications including tunable lasers, solid state lighting, artificial photosynthesis and new solar cells