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Optical transitions in WSe2 single crystals

DEEPA L. MAKHIJA1,* , K. D. PATEL1, V. M. PATHAK1, R. SRIVASTAVA1

Affiliation

  1. Department of Physics, Sardar Patel University, Vallabh Vidyanagar, Anand, - 388120, India

Abstract

Optical absorption in single crystals of WSe2 has been measured at room temperature near the fundamental absorption edge using light parallel to c – axis incident normally on the basal plane. Results have been analyzed on the basis of three dimensional (3D) and two dimensional (2D) models. Absorption near the fundamental edge was found to be due to indirect and direct allowed transitions on the basis of 3D model and indirect allowed transition on the basis of 2D model. The optical energy gaps corresponding to both transitions have also been determined.

Keywords

WSe2, Optical absorption, Direct and indirect allowed transitions.

Citation

DEEPA L. MAKHIJA, K. D. PATEL, V. M. PATHAK, R. SRIVASTAVA, Optical transitions in WSe2 single crystals, Optoelectronics and Advanced Materials - Rapid Communications, 3, 4, April 2009, pp.347-349 (2009).

Submitted at: March 31, 2009

Accepted at: April 23, 2009