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Fabrication of double-walled carbon nanotube film/TiO2 nanotube array heterojunctions with length-dependent photoresponse for broad band photodetectors |
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| Authors: | Ming-jie Yang Wei Liu Jia-lin Sun Jin-quan Wei Jia-lin Zhu |
| Institution: | 1728. Laboratory of Advanced Materials, Department of Material Science and Engineering, Tsinghua University, Beijing, 100084, China 2728. State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, 100084, China 3728. Key Laboratory for Advanced Materials Processing Technology of Education Ministry, Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China |
| Abstract: | A novel photodetector based on double-walled carbon nanotube (DWCNT) film/TiO2 nanotube array (TNA) heterojunctions was fabricated, which exhibited high photoresponse in a broad spectral range. The photoresponse of the detector was dramatically dependent on the length of the TNAs. High photocurrent-to-dark current ratio with a value of 3360 was observed in the visible range by optimizing the lengths of the TNAs. The photosensitive regions could be extended into the near-infrared range. These results reveal that DWCNT film/TNA heterojunctions show potential applications for broad band photodetectors. |
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