Inorganic lead halide perovskite CsPbCl3 with an absorption edge of ∼420 nm and exceptional optoelectronic properties is promising for selective ultraviolet (UV)-harvesting visibly transparent photovoltaics. However, the low solubilities of CsCl and PbCl2 precursor materials in common solvents make it difficult to prepare high-quality CsPbCl3 films with the desired thickness. Herein, we demonstrate a water-assisted two-step spin coating growth strategy for CsPbCl3 films. Because of the high solubility of CsCl but the low solubility of PbCl2 in water, it becomes possible to produce CsPbCl3 films by direct spin coating of CsCl/H2O solution onto a PbCl2 film without damaging it. After optimizing the dose of CsCl/H2O solution, CsPbCl3 films with a full surface coverage, pure perovskite phase, high crystallinity, large average grain size of 620 nm, and thickness of ∼310 nm are obtained. Consequently, the selective UV-harvesting visibly transparent PSCs with the CsPbCl3 films yield an optimized efficiency of 1.19%, an average visible transparency of 53.1%, and a color rendering index of 91.1. The findings of our study make it clear that the water-assisted two-step spin coating growth strategy is highly feasible to prepare CsPbCl3 films with desired characters, and thus, it has a great potential in the future development of CsPbCl3 optoelectronic devices.
Weihong Li,Chongjia Lin,Gan Huang,Jun Hur,Baoling Huang,Shuhuai Yao
Smart windows can selectively regulate excess solar radiation to reduce heating and cooling energy consumption in the built environment. However, the inevitable dissipation of ultraviolet and near-infrared into waste heat results in inefficient solar utilization. Herein, a dual-band selective solar harvesting (SSH) window is developed to realize full-spectrum utilization. A transparent photovoltaic, converting ultraviolet into electricity, and a transparent solar absorber, converting near-infrared into thermal energy, are integrated and coupled with a ventilation system to extract heat for indoor use. Compared with common transparent photovoltaics, the SSH window increases solar harvesting efficiency up to threefold while maintaining a considerable visible transmittance. Simulations suggest that the SSH window, besides generating electricity, delivers energy savings by over 30% higher than common smart windows. This is the first integration of transparent photovoltaic and transparent solar absorber into a window, which may open up a new avenue for the development of energy-efficient buildings.
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