Photoconductive characteristics of single-crystal CdS nanoribbons
Photoconductive characteristics of single-crystal CdS nanoribbons
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DOI：
10.1021/nl060867g
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发表时间：
2006-09-13
期刊：
影响因子：
10.8
通讯作者：
Lee, S. T.
中科院分区：
文献类型：
--
作者：
Jie, J. S.;Zhang, W. J.;Lee, S. T.
研究了硫化镉单纳米带的光导特性。系统地研究了器件的光谱响应、光强响应和时间响应等特性。研究发现，与已报道的传统薄膜和块体材料相比，硫化镉纳米带具有更快的响应速度，并且纳米带的尺寸对响应速度有显著影响，较小的硫化镉纳米带表现出更高的响应速度。高的光敏性和高的光响应速度归因于大的表面积比和高的单晶质量，以及纳米结构中复合势垒的降低。在不同气氛下的测量表明，环境气体(主要是氧气)的吸收可以通过俘获纳米带中的电子来显著改变纳米带的光敏性。
The photoconductive characteristics of CdS single nanoribbons were investigated. The device characteristics, including spectral response, light intensity response, and time response, were studied systematically. It is found that CdS nanoribbon has the response speed substantively faster than those ever reported for conventional film and bulk CdS materials and the size of nanoribbons has a significant influence on the response speed with smaller CdS nanoribbons showing higher response speed. The high photosensitivity and high photoresponse speed are attributable to the large surface-to-volume ratio and high single-crystal quality of CdS nanoribbons and the reduction of recombination barrier in nanostructures. Measurements in a different atmosphere demonstrate that the absorption of ambient gas ( mainly oxygen) can significantly change the photosensitivity of CdS nanoribbons through trapping electrons from the nanoribbons.