Journal of Applied Mathematics and Physics, 2016, 4, 391-397 Published Online February 2016 in SciRes. http://www.scirp.org/journal/jamp http://dx.doi.org/10.4236/jamp.2016.42046 How to cite this paper: Akhmadaliev, B.J., Mamatov, O.M., Polvonov, B.Z. and Yuldashev, N.K. (2016) Correlation between the Low-Temperature Photoluminescence Spectra and Photovoltaic Properties of Thin Polycrystalline CdTe Films. Journal of Applied Mathematics and Physics, 4, 391-397. http://dx.doi.org/10.4236/jamp.2016.42046 Correlation between the Low-Temperature Photoluminescence Spectra and Photovoltaic Properties of Thin Polycrystalline CdTe Films Bozorboy Joboralievich Akhmadaliev, Olmos Muhammaddovidovich Mamatov, Bakhtiyor Zaylobidinovich Polvonov, Nosirjon Khaydarovich Yuldashev Ferghana Polytechnic Institute, Ferghana, Uzbekistan Received 2 January 2016; accepted 23 February 2016; published 26 February 2016 Copyright © 2016 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/ Abstract A dominant intrinsic luminescence band, which is due to the surface potential barriers of crystal- line grains, and an edge doublet, which arises as an LO-phonon repetition of the e-h band, has been revealed in the low-temperature photoluminescence spectra of fine-grained obliquely deposited films. Doping film with In impurity leads to quenching of the doublet band, while further thermal treatment causes activation of the intrinsic band, the half-width and the blue shift of the red edge of which correlates with the maximum value of anomalously high photovoltage generated by the film. Keywords Film Structures, Low-Temperature Photoluminescence, Crystalline Grains, Surface Potential Barriers, Anomalous Photovoltaic Properties, Thermal Treatment, Photocarriers, Intrinsic Luminescence Band, LO-Phonon Repetitions 1. Introduction Low-temperature photoluminescence (LTPL) spectroscopy is one of the most sensitive and informative optical methods for studying semiconductors and film structures. LTPL spectra of CdTe crystals has been investigated in detail, and new methods for predicting and controlling electrical properties of semiconductor structures have been proposed on their basis. In particular, based on the study of the dynamics of changes in photoluminescence