151. Synthesis process dependent physico-chemical and opto-electronic properties of Cu2FeSnS4 nanoparticle films
- Author
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Krishnaiah Mokurala, Sung Hun Jin, Ajit Kumar, Ajay Kushwaha, and Nagaraju Mukurala
- Subjects
010302 applied physics ,Materials science ,Process Chemistry and Technology ,Nanoparticle ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Nanocrystalline material ,Hydrothermal circulation ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,symbols.namesake ,Chemical engineering ,Electrical resistivity and conductivity ,0103 physical sciences ,Materials Chemistry ,Ceramics and Composites ,symbols ,0210 nano-technology ,Spectroscopy ,Raman spectroscopy ,Chemical composition ,Stoichiometry - Abstract
The present work reports a comparative study of synthesis process-dependent physicochemical, optical, electrical, and photodetective properties of earth-abundant quaternary Cu2FeSnS4 (CFTS) nanoparticle-based films. CFTS nanoparticles are synthesized via solvothermal and monoethanolamine-assisted hydrothermal processes. X-ray diffraction (XRD) and Raman spectroscopy analyses confirm the phase purity of the synthesized particles. FE-TEM, FE-SEM, and energy-dispersive X-ray spectroscopy (EDS) results demonstrate the formation of smaller particles (~5–10 nm) with stoichiometric chemical composition and larger particles (~100 nm) with Cu-deficient chemical composition in hydrothermal and solvothermal processes, respectively. The optical bandgaps of the hydrothermal and solvothermal-processed CFTS nanocrystalline-based films are calculated to be 1.56 and 1.48 eV, respectively. The temperature-dependent electrical properties of the CFTS nanocrystalline films are analyzed by the transfer length method. The electrical conductivity of hydrothermally and solvothermally synthesized CFTS nanoparticle-based films increased from 31.02 ± 4.04 and 3.12 ± 0.69 mS/cm to 67.73 ± 5.84 and 17.62 ± 2.62 mS/cm, respectively, with an increase in the measuring temperature from 298 to 373 K. The temperature-dependent charge transport properties are attributed to the thermal activation of defects in the CFTS films. The hydrothermally synthesized CFTS nanoparticle-based visible photodetectors exhibited photoinactive properties. The solvothermally synthesized CFTS nanoparticle-based devices exhibited maximum photosensitivity of (21 ± 4) %, photoresponsivity of 128 ± 6 mA/W, and detectivity of 4.68 ± 0.86 × 109 Jones. The present study shows that the synthesis process significantly affects the morphology, chemical composition, optical properties, electrical properties, and performance of CFTS nanoparticle-based visible photodetectors.
- Published
- 2021
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