Online ISSN: 2515-8260

Keywords : band gap


Temperature change in the density of states and band gap of a semiconductor

Dadamirzaev Muzaffar Gulomkodirovich; Sharibaev Nosir Yusupjanovich

European Journal of Molecular & Clinical Medicine, 2021, Volume 8, Issue 1, Pages 679-684

In this work, the temperature dependence of the density of states is investigated using a mathematical model. The temperature broadening of the allowed bands in semiconductors is estimated. A convenient formula for calculating the temperature dependence of the bandgap of silicon is obtained using the approximation. Comparison of the experimental curve of the temperature dependence of the band gap and the curve according to the obtained formula for silicon showed agreement.

STRUCTURAL AND OPTICAL STUDIES OF GLYCINE BASED SINGLE CRYSTALS - A NONLINEAR OPTICAL MATERIAL

V. Vidhya; R. Muraleedharan; Ramajothi .; G. Vinitha

European Journal of Molecular & Clinical Medicine, 2020, Volume 7, Issue 4, Pages 2622-2633

The glycine based single crystals such as glycine zinc sulphate (GZS) and di(glycine) barium chloride (DGBC) was synthesized and single crystals are grown by solution growth technique. The unit cell parameters of grown crystals have been analyzed by single crystal XRD. The optical properties were studied using UV-Vis and photoluminescence spectroscopies. The TG/DTA analyzes were performed and the melting point of the sample was measured. The study of microhardness was measured on a prominent plane to determine mechanical strength using Vicker's hardness test. The NLO properties measurements were carried out using Q-switched Nd: YAG laser.