![]() ![]() The weaker of these bonds are reversibly formed and dissociated with small energy input. The intercalated compounds are stabilized by the formation of ionic, charge-transfer complex, van der Waals, and π-stacked fluorylaryl-aryl bonds. Myriad materials that adopt the oxide and halide forms of the perovskite crystal structure are known to readily accommodate intercalating species to form a rich array of unique compounds. This work validates a photovoltaic window technology that circumvents the fundamental tradeoff between efficient solar conversion and high visible light transmittance that limits conventional semitransparent PV window designs. The thermodynamics of switching and performance of the device are described. After cooling, the methylamine complex is re-formed, returning the absorber layer to the transparent state in which the device acts as a window to visible light. Upon illumination, photothermal heating switches the absorber layer-composed of a metal halide perovskite-methylamine complex-from a transparent state (68% visible transmittance) to an absorbing, photovoltaic colored state (less than 3% visible transmittance) due to dissociation of methylamine. ![]()
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