Switchable Mirror Thin Film for Energy Efficient Window

Abstract

  A new kind of energy efficient window using switchable mirror thin film which can be switched between mirror and transparent state freely is developed. Pd capped Mg₆Ni thin film prepared by magnetron sputtering shows excellent switching property. By exposure to 4% H₂ in Ar, the metallic film turns to a transparent state within a few seconds dramatically. A large size switchable mirror glass is fabricated and its switching is confirmed. Also all-solid-state swithchable mirror device based on Mg-Ni alloy is developed. It can be switched by applying voltage of 5 V to the device. If the switchalbe mirror window will be used practically, it is effective to reduce energy consumption for air-conditioning in buildings and automobiles.