Solvothermal Synthesis, Structural and Optical Properties of Phase-Pure Cu3BiS3 Nano-Powders Exhibiting Near-IR Photodetection
The Cu3BiS3 with a direct band gap of 1.4 eV, crystallizing in orthorhombic phase, devoid of any rare earth metals like indium was synthesized using a facile solvothermal route at 170 °C for 8 hrs. The structure and composition of the obtained nano-powders were confirmed by X-ray powder diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electronic microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The optical properties of the Cu3BiS3 nanorods were investigated by Raman and UV-Visible spectroscopy. Out of 36 Raman active modes, 16 modes were pronounced remaining silent. The current–voltage measurements were performed over the Cu3BiS3 film, on sandwich and in-plane geometries both in dark and light conditions. Measurements showed that in sandwich geometry, the I–V curves followed the SCLC mechanism at a higher bias, and thermionic emission in the in-plane geometry at a lower bias. In-plane IR photoresponse was higher compared to sandwich geometry.
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Document Type: Research Article
Publication date: April 1, 2012
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