A Magneto-Reflectivity Study of CuInTe2 Single Crystals

Abstract

CuInTe2 single crystals are studied using optical magneto-reflectance (MR) in magnetic fields B up to 20 T at 4.2 K. The spectra exhibit the A and B free excitons' blue shifting at increasing magnetic fields. Fitting quadratic functions to the experimental dependencies of the exciton spectral energy on B assuming a low field limit allow the determination of diamagnetic shift rates of 8.2 × 10−5 and 8.5 × 10−5 eV T−2 for the A and B free excitons, respectively. The excitons' reduced masses of 0.0575m0 and 0.0568m0 (m0 is the free electron mass), Rydbergs of 6.2 and 6.1 meV, and Bohr radii of 10.4 and 10.5 nm are then estimated. An electron effective mass of 0.062m0 and B sub-band effective hole mass of 0.70m0 are determined using a literature value of the A valence sub-band hole of 0.78m0. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim