Self Powered Highly Enhanced Dual Wavelength ZnO@CdS Core-Shell Nanorod Arrays Photodetector: An Intelligent Pair.
Self Powered Highly Enhanced Dual Wavelength ZnO@CdS Core-Shell Nanorod Arrays Photodetector: An Intelligent Pair.
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DOI：
10.1021/acsami.5b03184
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发表时间：
2015-07
影响因子：
9.5
通讯作者：
Sanjit Sarkar;D. Basak
中科院分区：
文献类型：
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作者：
Sanjit Sarkar;D. Basak
面对迫在眉睫的能源危机，开发低能量甚至零能量的光电器件极为重要。自供电设备的多光谱光敏特性提供了一个额外的强大工具。我们通过简单的水化学方法开发了一种前所未有的高性能双波长自供电ZnO@CdS/PEDOT:PSS核壳纳米棒阵列光电探测器，其中利用了智能材料对（即ZnO和CdS）之间合适的能带对准。该器件的一个值得注意的优点是它们表现出非常尖锐和突出的双波长光敏性，该器件的紫外光和可见光灵敏度（光照下电流（Iphoto）/黑暗下电流（Idark）之比）比原始ZnO高两个数量级，分别达到2.8×10(3)和1.07×10(3)。同时，这些经过溶液处理的光电探测器可以实现快于 20 毫秒的时间响应。本研究为设计双波长高光敏性核壳纳米结构器件提供了非常重要的方向。
On the face of the impending energy crisis, developing low-energy or even zero-energy photoelectronic devices is extremely important. A multispectral photosensitivity feature of a self-powered device provides an additional powerful tool. We have developed an unprecedented high performance dual wavelength self-powered ZnO@CdS/PEDOT:PSS core-shell nanorods array photodetector through a simple aqueous chemical method wherein a suitable band alignment between an intelligent material pair, i.e. ZnO and CdS, has been utilized. Besides a noteworthy advantage of the devices being that they show a very sharp and prominent dual wavelength photosensitivity, both the ultraviolet and visible light sensitivity (ratio of current under illumination (Iphoto)/current under dark (Idark)) of the device are two orders of higher magnitude than those of pristine ZnO, attaining values of 2.8 × 10(3) and 1.07 × 10(3), respectively. At the same time, temporal responses faster than 20 ms could be achieved with these solution-processed photodetectors. The present study provides a very important direction to engineer core-shell nanostructured devices for dual wavelength high photosensitivity.