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.

中文翻译：

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WO3/ZnO 纳米线异质结作为空穴传输通道用于建立持久的全息条纹

过渡金属氧化物表现出优异的光致变色性能，可应用于光信息存储。然而，脱色反应阻碍了氧化物光学双稳态的形成。在这里，我们将 WO3 纳米粒子沉积到 ZnO 纳米线阵列中以形成多位点异质结。异质结微界面充当空间分散的空穴传输通道，以抑制 WO3 载流子复合并将弛豫时间延长至 104 秒以上。光致变色响应范围覆盖整个可见光-近红外区域，吸收调制幅度显着提高。即使在非常低的写入功率下，具有交替排列的 WO3 和 HxWO3 的持久全息条纹也显示出达到 1.1% 的衍射效率。