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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