Kinetic model of radiative recombination processes in 2H-MoS2 crystals

Abstract

Steady-state photoluminescence (PL) measurements revealed 2H-MoS2 crystals. Two distinct radiative regions in the near infrared are performed. The first region consisting of several sharp lines is produced by bound excitons related to the halogen transport agent intercalated within the van der Waals gap of the layered compound. The second region is a broad spectral band, originates from the radiative recombination between an intrinsic defect center and the valence band in the conditions of a strong electron-phonon coupling. The spectral and temperature behavior of the PL intensity are described in the framework of a two- channel kinetic recombination model in thermal equilibrium conditions.