Photoconductive characteristics of single-crystal CdS nanoribbons.
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.
Jie
J S
JS
Center Of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Science, City University of Hong Kong, Hong Kong Special Administrative Region, China.
Zhang
W J
WJ
Jiang
Y
Y
Meng
X M
XM
Li
Y Q
YQ
Lee
S T
ST
D003460:Crystallization / Q000379:methods*; D004307:Dose-Response Relationship, Radiation; D004553:Electric Conductivity; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D008027:Light; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods* / Q000639:trends; D010777:Photochemistry / Q000295:instrumentation / Q000379:methods*; D011829:Radiation Dosage; D014159:Transducers