We developed all-solid-state switchable mirror on flexible plastic [polyethylene terephthalate (PET)] sheet in the view point of low process cost and easy handling. Its optical switching property was investigated. Though the device on PET sheet showed over 4000cycles of switching in durability test, it was lower than that on glass. The reasons seemed to be related with heterogeneous structure, oxidation of surface layer and adhesion of the film. However, it remarkably results that the device on plastic sheet showed such a high durability nonetheless because the sheet is weak to mechanical stress.

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To increase the switching stability of switchable mirrors based on Mg-Ni alloy thin films, we inserted a thin Ti buffer layer between a Mg-Ni alloy thin film and a Pd top layer, which were prepared by DC magnetron sputtering. The optical properties and switching durability of the Ti-inserted switchable mirrors were investigated by gasochromic switching. These samples showed no degradation up to 450 switching cycles and an improvement in their stability was apparent. Moreover, the responsivity in dehydrization was also improved by Ti insertion.

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The short circuit current density of perovskite solar cell (PSC) was boosted by modulating the dominated plane facets of TiO electron transport layer (ETL). Under optimized condition, TiO with dominant {001} facets showed (i) low incident light loss, (ii) highly smooth surface and excellent wettability for precursor solution, (iii) efficient electron extraction, and (iv) high conductivity in perovskite photovoltaic application. A current density of 24.19 mA cm was achieved as a value near the maximum limit. The power conversion efficiency was improved to 17.25%, which was the record value of PSCs with DC magnetron sputtered carrier transport layer. What is more, the room-temperature process had a great significance for the cost reduction and flexible application of PSCs.