ZnO nanoneedle/H2O solid-liquid heterojunction-based self-powered ultraviolet detector.
ZnO nanoneedle/H2O solid-liquid heterojunction-based self-powered ultraviolet detector.
复制标题
ZnO纳米针/H2O固液异质结自供电紫外探测器
DOI：
10.1186/1556-276x-8-415
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发表时间：
2013-10-08
影响因子：
--
通讯作者：
Mei L
中科院分区：
文献类型：
--
作者：
Li Q;Wei L;Xie Y;Zhang K;Liu L;Zhu D;Jiao J;Chen Y;Yan S;Liu G;Mei L
采用水热法在较低温度下在含氟氧化锡镀膜玻璃上垂直生长ZnO纳米针阵列。以ZnO纳米针为活性光阳极，H2O为电解液制备了自供电型光电电池型紫外探测器。这种固体-液体异质结提供了扩大的ZnO/水接触面积和电子传递的直接途径。通过将该紫外光电探测器连接到安培计，可以在没有电源的情况下使用输出短路光电流来量化紫外光的强度。该紫外探测器具有高光敏性、优良的光谱选择性和快速的零偏光响应。自供电行为可以很好地解释为在固液异质结界面附近形成空间电荷层，从而产生内置电位，使固液异质结在光伏模式下工作。
ZnO nanoneedle arrays were grown vertically on a fluorine-doped tin oxide-coated glass by hydrothermal method at a relatively low temperature. A self-powered photoelectrochemical cell-type UV detector was fabricated using the ZnO nanoneedles as the active photoanode and H2O as the electrolyte. This solid-liquid heterojunction offers an enlarged ZnO/water contact area and a direct pathway for electron transport simultaneously. By connecting this UV photodetector to an ammeter, the intensity of UV light can be quantified using the output short-circuit photocurrent without a power source. High photosensitivity, excellent spectral selectivity, and fast photoresponse at zero bias are observed in this UV detector. The self-powered behavior can be well explained by the formation of a space charge layer near the interface of the solid-liquid heterojunction, which results in a built-in potential and makes the solid-liquid heterojunction work in photovoltaic mode.