| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Low-Cost UV-IR Dual Band Detector Using Nonporous ZnO Film Sensitized by PbS Quantum Dots |
| SHAO Jia-Feng1, A. G. U. Perera2, P. V. V. Jayaweera2, HE De-Yan1 |
| 1School of Physics Science and Technology, Lanzhou University, Lanzhou 7300002Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA |
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| Cite this article: |
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SHAO Jia-Feng, A. G. U. Perera, P. V. V. Jayaweera et al 2010 Chin. Phys. Lett. 27 027302 |
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Abstract A low-cost photoconductive dual-band detector was prepared using a nanoporous ZnO film sensitized by PbS quantum dots (QDs). At room temperature the device shows a UV response in the wavelength range of 200-400 nm with a 370 nm peak responsivity of 4.0×105 V/W and a vis-NIR response from 500 to 1400 nm with a 700 nm peak responsivity of 5.4×105 V/W. By increasing the size of the PbS QD, the response can be extended up to 2.9 μm. It is suggested that the UV response is a result of interband absorption of UV radiation by ZnO and the IR response comes from the absorption of PbS QDs.
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| Keywords:
73.21.La
73.22.-f
73.63.Bd
73.25.+i
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Received: 23 July 2009
Published: 08 February 2010
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| PACS: |
73.21.La
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(Quantum dots)
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73.22.-f
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(Electronic structure of nanoscale materials and related systems)
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73.63.Bd
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(Nanocrystalline materials)
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73.25.+i
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(Surface conductivity and carrier phenomena)
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