An Efficient Way to Assemble ZnS Nanobelts as Ultraviolet-Light Sensors with Enhanced Photocurrent and Stability
An Efficient Way to Assemble ZnS Nanobelts as Ultraviolet-Light Sensors with Enhanced Photocurrent and Stability
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DOI：
10.1002/adfm.200901878
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发表时间：
2010-02-08
影响因子：
19
通讯作者：
Golberg, Dmitri
中科院分区：
文献类型：
--
作者：
Fang, Xiaosheng;Bando, Yoshio;Golberg, Dmitri
尽管一维纳米结构光电探测器的制备和性能优化已经取得了显著的进展，但开发一种有效且低成本的高性能器件仍然是一个挑战，例如高光电流/暗电流比，光电流稳定性和快速时间响应。本文报道了一种有效且低成本的方法，通过增加暴露于光的纳米带表面积，在不使用光刻技术的情况下实现高性能的基于ZnS纳米带的“可见盲”微尺度紫外（UV）光传感器。与单个基于纳米带的传感器相比，该器件表现出约750倍的光电流增强和超快的时间响应。当通道距离从2 μ m改变到100 μ m或传感器环境从空气改变到真空和不同的测量温度（60和150 ℃）时，光电流稳定性和对UV光的时间响应不显著改变。将测量条件恢复到空气和室温后，其光电特性可以得到很好的恢复。所得ZnS纳米带光电探测器的低成本和高性能保证了其在UV-A波段工作的可见盲UV光传感器的最大潜力。
Although there has been significant progress in the fabrication and performance optimization of one-dimensional nanostructure-based photodetectors, it is still a challenge to develop an effective and low-cost device with high performance characteristics, such as a high photocurrent/dark-current ratio, photocurrent stability, and fast time response. Herein an efficient and low-cost method to achieve high-performance 'visible-blind' microscale ZnS nanobelt-based ultraviolet (UV)-light sensors without using a lithography technique, by increasing the nanobelt surface areas exposed to light, is reported. The devices exhibit about 750 times enhancement of a photocurrent compared with individual nanobelt-based sensors and an ultrafast time response. The photocurrent stability and time response to UV-light do not change significantly when a channel distance is altered from 2 to 100 mu m or the sensor environment changes from air to vacuum and different measurement temperatures (60 and 150 degrees C). The photoelectrical behaviors can be recovered well after returning the measurement conditions to air and room temperature again. The low cost and high performance of the resultant ZnS nanobelt photodetectors guarantee their highest potential for visible-blind UV-light sensors working in the UV-A band.