Probing into the optical and electrical properties of hybrid Zn1−xCoxSe thin films
Probing into the elemental composition, structural, morphological, optical and electrical transport properties of chemically deposited Zn 1−x Co x Se (0 ≤ x ≤ 0.275) thin films with a special emphasis given to the Co 2+ -concentration is presented in this paper. Elemental and structural analysis con...
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Veröffentlicht in: | Journal of materials science. Materials in electronics 2018-03, Vol.29 (5), p.3704-3714 |
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Sprache: | eng |
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Zusammenfassung: | Probing into the elemental composition, structural, morphological, optical and electrical transport properties of chemically deposited Zn
1−x
Co
x
Se (0 ≤ x ≤ 0.275) thin films with a special emphasis given to the Co
2+
-concentration is presented in this paper. Elemental and structural analysis confirmed the successful realization of Co(ZnSe) thin films. Addition of Co
2+
into ZnSe host lattice caused morphological changes from globule like morphology to the formation of leaf like appearance composing the disc-decked micro-flakes elongated in size. The optical studies done in the range of wavelengths between 350 to 1200 nm showed a slight red shift in the optical spectrum with increased Co
2+
concentration in the ZnSe matrix. Effect of increased impurity addition is also reflected in the band gap measurements that a decrease in the bandgap, typically from 2.71 to 1.96 eV, is observed for an increase in Co
2+
concentration from x = 0–0.275. The other optical parameters namely, refractive index, extinction coefficient, power factor and dielectric constants were determined from these studies and other variations are adequately explained as a special reference to the Co-concentration. The composition dependence of the electrical transport characteristics were studied using the two-probe and Hall measurement techniques. The effect of Co-concentration on the transport characteristics has been studied and mechanism of an electrical conduction is discussed. A continuous increase in an electrical conductivity with n-type conduction has been observed for these samples. |
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ISSN: | 0957-4522 1573-482X |
DOI: | 10.1007/s10854-017-8302-7 |