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Anima Ghosh

Publications and source records attributed to Anima Ghosh.

2 recordsLinked to original sources
arXiv2023

Structural stability, electronic band structure, and optoelectronic properties of quaternary chalcogenide CuZn2MS4 (M =In and Ga) compounds via first principles

Quaternary chalcogenide compositions have been broadly explored due to their promising potential for various optoelectronic applications. The band structure, density of states and optical properties of CuZn2InS4 and CuZn2GaS4 for kesterite and stannite structures were studied with full potential augmented plane wave method (FP-LAPW) via Wien2k code. The total energy in equilibrium was calculated for different possible crystal structures and their phase stability, and transitions with p-d orbitals were analyzed. The absorption coefficient, dielectric function, and refractive index of these materials were also explored within a broad range of energy. We compared the calculated band gap values with available experimental results.

cond-mat.mtrl-sci↗
arXiv2023

Superior visible photoelectric response with Au/Cu2NiSnS4 core-shell nanocrystals

The incorporation of plasmonic metal nanostructures into semiconducting chalcogenides, in the form of core-shell structures, represents a promising approach to boosting the performance of photodetectors. In this study, we combined Au nanoparticles with newly developed copper-based chalcogenides Cu2NiSnS4 (Au/CNTS), to achieve an ultrahigh optoelectronic response in the visible regime. The high-quality Au/CNTS core-shell structure was synthesized by developing a unique colloidal hot-injection method, which allowed excellent control over sizes, shapes, and elemental compositions. The fabricated Au/CNTS hybrid core-shell structure exhibited enhanced optical absorption, carrier extraction efficiency, and improved photo-sensing performance, owing to the plasmonic-induced resonance energy transfer effect of the Au core. This effect led to a significant increase in carrier density between the Au core and CNTS shell. These values outperformed a CNTS-based gate-free visible photodetector.

cond-mat.mtrl-sci↗