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| New progress in the photoconductive characteristics of CdS nanoribbons |
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| New progress in the study of CdS nanoribbons has been achieved by Prof. Xiangmin Meng, Prof. Wenjun Zhang and Prof. Shuit Tong Lee, in Technique Institute of Physics Chemistry, CAS. The project was supported by the National Natural Science Foundation of China, Chinese Academy of Sciences, and City University of Hong Kong.
Photoconductive devices were duplicated by using single CdS nanoribbons. The device characteristics, including spectral, light intensity, 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. These results indicated that the CdS single nanoribbon devices may find promising photoelectronic applications as nanoscale photosensors and gas sensors. The results were published in Nano Letters (Vol.6, No.9, 2006, 1887). |
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