Influence of Morphology on the Optical Properties of Self-Grown Nanowire Arrays

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• 作者：Liqiang Li ; Zhufeng Liu ; Ming Li ; Lan Hong ; Hui Shen ; Chaolun Liang ; Hong Huang ; Dan Jiang ; Shan Ren
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：February 28, 2013
• 年：2013
• 卷：117
• 期：8
• 页码：4253-4259
• 全文大小：484K
• 年卷期：v.117,no.8(February 28, 2013)
• ISSN：1932-7455

文摘

Nanostructured materials such as nanowire arrays often absorb light more strongly than thin films, so they can be used to improve the performance of solar cells. In this study, a series of self-grown Cu₂S nanowire arrays with different diameters, lengths, and morphologies is prepared by solid鈥揼as reaction between Cu foil and a mixture of H₂S and O₂. The structure of the arrays is characterized by XRD, TEM, XPS, and Raman. Their light absorption performance is investigated systematically by diffuse reflectance and photoluminescence spectroscopy. The nanowire arrays are single-crystal Cu₂S semiconductors, and their band gap can be adjusted by changing the morphology, diameter, and length of nanowires in the arrays. The light-absorption ability is enhanced from 70% for a planar Cu₂S film to 93.5% for a Cu₂S nanowire arrays and is less sensitive to both the wavelength and incident angle of light because of the morphology and distribution of the nanowires. The light absorption is high (about 92鈥?5%) over a wide range of wavelengths (240鈥?70 nm) and only decreases by 3% as the incident angle increases from 10 to 40掳. This research shows the potential of Cu₂S nanowire arrays for use in solar energy applications.