Optical Properties of Sn0.5Se2.5 Single Crystals

Kaushik R Patel; Duhita Lakhataria; M. P. Deshpande

Volume : VI, Issue : III, March - 2016

Optical Properties of Sn0.5Se2.5 Single Crystals

Kaushik R Patel, Duhita Lakhataria, M. P. Deshpande

Abstract :

The single crystals of Sn0.5Se2.5 were grown by chemical vapour transport technique using iodine as a transporting agent. The grown crystals were characterized with the help of energy dispersive analysis by X–ray (EDAX), which gives confirmation about its stoichiometry. The band gap of Sn0.5Se2.5 single crystals was determined by optical absorption method. The measurement of this crystal was taken at room temperature near the fundamental edge of absorption. This spectrum was obtained by UV–VIS–NIR spectrophotometer in the range of 700 nm–1400 nm. Results have been analyzed on the basis of two and three–dimensional model. Both direct and indirect transitions are involved in the absorption process. The indirect transition was found to be allowed with two phonons involved in the process. The direct as well as indirect energy gaps and phonon energies for this crystal has been estimated. The results obtained are discussed in detail.