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
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
摘要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.
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.
SHAO Jia-Feng;A. G. U. Perera;P. V. V. Jayaweera;HE De-Yan. Low-Cost UV-IR Dual Band Detector Using Nonporous ZnO Film Sensitized by PbS Quantum Dots[J]. 中国物理快报, 2010, 27(2): 27302-027302.
SHAO Jia-Feng, A. G. U. Perera, P. V. V. Jayaweera, HE De-Yan. Low-Cost UV-IR Dual Band Detector Using Nonporous ZnO Film Sensitized by PbS Quantum Dots. Chin. Phys. Lett., 2010, 27(2): 27302-027302.
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