Structural and optical properties of Mn-doped CdS thin films prepared by ion implantation

We report on structural and optical properties of Mn-doped CdS thin films prepared by 190 keV Mn-ion implantation at different temperatures. Mn-ion implantation in the fluence range of 1 x 10(13)-1 x 10(16) ions cm(-2) does not lead to the formation of any secondary phase. However, it induces structural disorder, causing a decrease in the optical band gap. This is addressed on the basis of band tailing due to creation of localized energy states and Urbach energy calculations. Mn-doped samples exhibit a new band in their photoluminescence spectra at 2.22 eV, which originates from the d-d ((4)T(1) -> (6)A(1)) transition of tetrahedrally coordinated Mn(2+) ions. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3151712]