EFFECT OF PRESSURE AND THERMAL EXPANSION ON THE OPTICAL ABSORPTION EDGE AND DEFORMATION POTENTIAL MODEL IN A LAYERED TLGAS2 CRYSTAL
Keywords:
thermal expansion, optical absorption edge, model of deformation potential, compression, stretching, deformation, phenomenaAbstract
The influence of pressure and thermal expansion on the optical absorption edge and the model of the deformation potential in a layered TlGaS2 crystal are investigated. It was found that compression along the C axis leads to an increase in Eg (as in АIIIBVI crystals) by ~10 meV at P = 1kbar. At the same time, the layer stretching leads to a decrease in Eg by ~13 meV – as a result, Eg decreases by ~3 meV.