Quantum confinement effect in <Emphasis Type="Italic">β</Emphasis>-SiC nanowires |
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Authors: | Gang Peng Xiaoyan Yu Yan-Lan He Gong-Yi Li Yi-Xing Liu Xinfang Zhang Xue-Ao Zhang |
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Institution: | 1.College of Science,National University of Defense Technology,Changsha,China;2.School of Electronic & Communication Engineering,Guiyang University,Guiyang,China |
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Abstract: | The quantum confinement effect is important in nanoelectronics and optoelectronics applications; however, there is a discrepancy between the theory of quantum confinement, which indicates that band-gap widening occurs only at small sizes, and experimental observations of band-gap widening in large-diameter nanowires (NWs). This paper reports an obvious blue shift of the absorption edge in the UV-visible absorption spectra of SiC NWs with diameters of 50–300 nm. On the basis of quantum confinement theory and high-resolution transmission electron microscopy images of SiC NWs, band-gap widening in SiC NWs with diameters of up to hundreds of nanometers is fully explained; the results could help to explain similar band-gap widening in other NWs with large diameters. |
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