银纳米颗粒@氧化锌纳米线复合阵列：一种吸收增强型紫外光电探测器。

Ag nanoparticles@ZnO nanowire composite arrays: an absorption enhanced UV photodetector.

作者信息

Liu Yang, Zhang Xianghui, Su Jun, Li Haixia, Zhang Qi, Gao Yihua

出版信息

Opt Express. 2014 Dec 1;22(24):30148-55. doi: 10.1364/OE.22.030148.

DOI:10.1364/OE.22.030148

Abstract

A novel heterojunction ultraviolet (UV) photodetector of assembling Ag nanoparticles (NPs) onto ZnO nanowire (NW) arrays was fabricated via combination of chemical vapor deposition and thermal evaporation route. The fabricated composite Ag@ZnO NW arrays show blue-shift of UV peaks, suppression of the visible peaks, and obvious enhancements in absorption from ultraviolet to infrared region and photoluminescence (PL) emission at room-temperature. These phenomena are attributed to the Localized Surface Plasmon Resonance (LSPR) effect. Benefiting from absorption enhancement and surface heterojunctions, Ag@ZnO heterostructures show a photocurrent increment by 117%, a short response time of 80 ms and a recovery time of 3.27 s under 365 nm UV illumination of 0.24 mW/cm². This research presented a simple route to obtain high performance UV photodetectors and would be of some benefit in optical-electron devices manufacture.

摘要

通过化学气相沉积和热蒸发相结合的方法，制备了一种新型的将银纳米颗粒（NPs）组装到氧化锌纳米线（NW）阵列上的异质结紫外（UV）光电探测器。制备的复合Ag@ZnO NW阵列在室温下表现出紫外峰的蓝移、可见峰的抑制以及从紫外到红外区域吸收和光致发光（PL）发射的明显增强。这些现象归因于局域表面等离子体共振（LSPR）效应。得益于吸收增强和表面异质结，Ag@ZnO异质结构在0.24 mW/cm²的365 nm紫外光照下，光电流增加了117%，响应时间短至80 ms，恢复时间为3.27 s。本研究提出了一种获得高性能紫外光电探测器的简单方法，将对光电器件制造有所助益。