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首页> 外文期刊>Nanotechnology >Sandwiched assembly of ZnO nanowires between graphene layers for a self-powered and fast responsive ultraviolet photodetector
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Sandwiched assembly of ZnO nanowires between graphene layers for a self-powered and fast responsive ultraviolet photodetector

机译：石墨烯层之间的ZnO纳米线的夹层组件，用于自供电和快速响应的紫外线光电探测器

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摘要

A heterostructure of graphene and zinc oxide (ZnO) nanowires (NWs) is fabricated by sandwiching an array of ZnO NWs between two graphene layers for an ultraviolet (UV) photodetector. This unique structure allows NWs to be in direct contact with the graphene layers, minimizing the effect of the substrate or metal electrodes. In this device, graphene layers act as highly conducting electrodes with a high mobility of the generated charge carriers. An excellent sensitivity is demonstrated towards UV illumination, with a reversible photoresponse even for a short period of UV illumination. Response and recovery times of a few milliseconds demonstrated a much faster photoresponse than most of the conventional ZnO nanostructure-based photodetectors. It is shown that the generation of a built-in electric field between the interface of graphene and ZnO NWs effectively contributes to the separation of photogenerated electron-hole pairs for photocurrent generation without applying any external bias. Upon application of external bias voltage, the electric field further increases the drift velocity of photogenerated electrons by reducing the charge recombination rates, and results in an enhancement of the photocurrent. Therefore, the graphene-based heterostructure (G/ZnO NW/G) opens avenues to constructing a novel heterostructure with a combination of two functionally dissimilar materials.
机译：石墨烯和氧化锌（ZnO）纳米线（NWs）的异质结构是通过将ZnO NWs阵列夹在两个石墨烯层之间制成的，用于紫外线（UV）光电探测器。这种独特的结构使NW可以直接与石墨烯层接触，从而最大程度地减少了衬底或金属电极的影响。在该装置中，石墨烯层充当具有高迁移率的所产生电荷载流子的高导电电极。对紫外线照射具有极好的灵敏度，即使在较短的紫外线照射下也具有可逆的光响应。几毫秒的响应时间和恢复时间显示出比大多数传统的基于ZnO纳米结构的光电探测器快得多的光响应。结果表明，在石墨烯与ZnO NWs的界面之间产生的内置电场有效地有助于分离光生电子空穴对，从而在不施加任何外部偏压的情况下产生光电流。在施加外部偏置电压时，电场通过降低电荷复合率进一步提高了光生电子的漂移速度，并导致了光电流的增加。因此，基于石墨烯的异质结构（G / ZnO NW / G）为结合两种功能不同的材料构建新型异质结构开辟了道路。

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