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

Abstract

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 1×1013–1×1016 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 (T41→A61) transition of tetrahedrally coordinated Mn2+ ions.

Structural, optical and photoconductivity characteristics of manganese doped cadmium sulfide nanoparticles synthesized by co-precipitation method

“…The reduced PL intensity of green emission indicates transfer of energy from excited carriers trapped at the surface to Mn 2+ ions. The orange emission ∼575 nm is due to 4 T 1 → 6 A 1 transition of Mn 2+ [15,20,[50][51][52][53][54]. Maximum orange emission intensity is found for 1 mol% Mn concentration.…”

Structural, optical and magnetic studies on non-aqueous synthesized CdS:Mn nanomaterials

“…Further they reported that RE 3+ doped CdS nanocrystals show complete broadband absorption at well below their band edge to UV region. [9][10][11][12][13]. The methods stated above are very much sophisticated and highly complicated in procedure.…”

Influence of heat treatment on the optical properties of GeSe2 thin films

“…Also investigations of their optical properties are important to understand the electronic and band structure details. In general, Urbach energy are considered to be a telltale signature of the presence of different types of impurities, structural disorder, point defects and grain boundaries in amorphous chalcogenide glasses [2]. Also the heat treatment of chalcogenide films results in a decrease of the degree of disorder and defects present in these amorphous films [3], which is known to increase the optical energy gap.…”