Temperature-dependent optical properties of Pb1-xMnxSe films epitaxially grown on Zn0.04Cd0.96Te substrates

We report temperature-dependent optical transmission studies on Pb1-xMnxSe films grown on Zn0.04Cd0.96Te substrates by molecular beam epitaxy. The measurements were carried out from liquid nitrogen temperature to room temperature and in the frequency range of 400-4000cm(-1). The transition energy E-g of 0.215 eV. damping parameter Gamma of 4.1 meV, refractive index of 5.0, and Urbach bandtail parameter E. of similar to 8 meV were determined by lifting the experimental transmission spectra for Pb1-xMnxSe at, for instance, x=0.038 and 85 K. Other parameters, Such as absorption coefficient alpha, the oscillator strength alpha, and the background dielectric constant epsilon(infinity) were also obtained. Temperature dependences of Gamma and E-u indicate stronger carrier-phonon interactions in the Pb1-xMnxSe films. (c) 2008 Elsevier B.V. All rights reserved.