SnS Quantum Dots – A Green Photovoltaic Material

Sakshi Chaudhary¹ and Salam Samarendra Singh²

¹Department of Physics, D. J. College, Baraut, U. P. -250611, India

²Department of Mathematics, G.P.Women’s College, Imphal, Manipur – 795001, India

Email of corresponding author: sakshichaudhary950@gmail.com

Structures and electronic properties of SnS quantum dots (QDs) are studied by using first principles density functional theory (DFT) for their potential applications in the design of environmentally friendly green solar cells. QDs of different sizes are investigated and effect of ligation on geometry optimization and the electronic properties of the QDs are investigated. Also, effect of stoichiometry of the QDs is also investigated. There is a red shift on the absorption peak of the QDs as the size of QDs is increased.

Keywords: Quantum dots, solar cells, DFT.

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Characteristics of Plasmonic Solar Cell Embedded by Silver Nanoparticles

Anjna Chetan, Rajeev Kumar, Kh.S. Singh and Sandeep Kumar*,

Department of Physics, D. J. College, Baraut, Baghpat, Uttar Pradesh, India-250611.

Corresponding author – *sandeep12kumar@gmail.com

Characteristics of plasmonic solar cells are studied.  In particular, amorphous silicon thin films dispersed with Ag nanoparticles are studied theoretically using effective medium theory. The dependence of electron generation rate and the current density on the thickness of the film is investigated. The effect of dispersion of Ag nanoparticles on the absorption coefficient of nanocomposite is also investigated. The dependence of external quantum efficiency (EQE) on wavelength is estimated. There is almost no change in the open circuit voltage of the film with the introduction of Ag nanoparticles but there is an appreciable enhancement of closed circuit current density with Ag nanoparticles dispersed.

Keywords:  Plasmonic solar cells, nanoparticles, effective-medium theory, external quantum efficiency.

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