Eur. Phys. J. Appl. Phys. (2013) 62: 30302
https://doi.org/10.1051/epjap/2013120273

Effect of spray solution flow rate on the physical properties of CuInS₂

Laboratoire de Physique de la Matière Condensée, Faculté des Sciences de Tunis, El Manar 2092, Tunisia

^a e-mail: zeinebseboui@gmail.com

Received: 11 July 2012
Revised: 11 January 2013
Accepted: 17 April 2013
Published online: 11 June 2013

Abstract

CuInS₂ thin films have been successfully prepared on Pyrex substrates using spray pyrolysis technique. In this work, we study the effect of the flow rate on the physical properties of CuInS₂ thin films. X-ray diffraction pattern reveals the presence of tetragonal structure with (1 1 2) preferential orientation for CIS thin layers. Optical analysis by means of transmission T(λ) and reflection R(λ) measurements allows to determine the direct band gap energy value in the order of 1.44 eV, indicating that CuInS₂ compound has absorbing properties favorable for applications in solar cell devices. Photoluminescence measurements are performed on CuInS₂ crystals and the analysis reveals that the emission is mainly due to donor-acceptor pair transitions.