Abstract
Transition metal oxides exhibit an excellent photochromic property, which can be applied in optical information storage. However, the decolorization reaction hinders the formation of optical bi-stable states of the oxides. Here, we deposit WO3 nanoparticles into ZnO nanowire arrays to form a multi-site heterojunction. The heterojunction micro-interface acts as a spatially dispersed hole transport channel to suppress the WO3 carrier recombination and to prolong the relaxation time more than 104 s. The photochromic response range covers the whole visible-NIR regions, and the absorption modulation amplitude is improved significantly. Persistent holographic fringes with alternated arrangement of WO3 and HxWO3 show a diffraction efficiency reaching 1.1% even at a very low writing power. This work is expected to be one of the most pursued application strategies for the integration of storage and the display of high-density information.
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