Title |
Photodeposition of Ag2S on TiO2 nanorod arrays for quantum dot-sensitized solar cells
|
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Published in |
Discover Nano, January 2013
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DOI | 10.1186/1556-276x-8-10 |
Pubmed ID | |
Authors |
Hongwei Hu, Jianning Ding, Shuai Zhang, Yan Li, Li Bai, Ningyi Yuan |
Abstract |
Ag2S quantum dots were deposited on the surface of TiO2 nanorod arrays by a two-step photodeposition. The prepared TiO2 nanorod arrays as well as the Ag2S deposited electrodes were characterized by X-ray diffraction, scanning electron microscope, and transmission electron microscope, suggesting a large coverage of Ag2S quantum dots on the ordered TiO2 nanorod arrays. UV-vis absorption spectra of Ag2S deposited electrodes show a broad absorption range of the visible light. The quantum dot-sensitized solar cells (QDSSCs) based on these electrodes were fabricated, and the photoelectrochemical properties were examined. A high photocurrent density of 10.25 mA/cm2 with a conversion efficiency of 0.98% at AM 1.5 solar light of 100 mW/cm2 was obtained with an optimal photodeposition time. The performance of the QDSSC at different incident light intensities was also investigated. The results display a better performance at a lower incident light level with a conversion efficiency of 1.25% at 47 mW/cm2. |
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