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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