Effect of Illumination Intensities on the Visible and Infrared Photoresponse of Cu2SnS3 Nanostructures
We report the synthesis of Cu2SnS3 nanostructures using solvothermal technique and the study of its visible and infrared (IR) photoresponse under different illumination intensities. The CTS nano-crystals were found to have tetragonal crystal structure using X-ray Diffraction (XRD). Both flower and sphere shaped structures of around 1.5 μm were obtained as seen using scanning electron microscopy (SEM). Transmission electron microscopy (TEM) was used to study the crystalline nature as well as the different planes present in the crystal. The band gap of the obtained crystals was found to be 1.4 eV using optical studies. The visible photocurrent increased from 0.25 μA at dark to 0.42 μA at 1.05 suns and 1 V applied bias. The sensitivity increased from 1.25 at 0.88 suns to 1.68 at 1.05 suns. The IR photocurrent increased from 0.13 μA at dark to 0.66 μA at 477.7 mWcm−2. The device exhibited an increase in the sensitivity, responsivity, external quantum efficiency and specific detectivity from 1.23, 0.10 mA/W, 0.016% and 5.02 × 108 Jones respectively at 127.4 mWcm−2 to 4.95, 0.46 mA/W, 0.071% and 2.22×109 Jones respectively at 477.7 mWcm−2. The time response of the photocurrent was measured over different ON-OFF cycles and the cyclic stability of the device was verified.
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Document Type: Research Article
Affiliations: Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
Publication date: January 1, 2017
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