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