CdCl2 treatment and its role in enhancing photodetection properties of CdTe and Cd1-xZnxTe films

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science and Engineering: B Pub Date : 2025-03-10 DOI:10.1016/j.mseb.2025.118208

S. Yılmaz , B.M. Başol , İ. Polat , M.Taykurt Daday , M. Tomakin , T. Küçükömeroğlu , E. Bacaksız

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Abstract

Close space sublimated CdTe and Cd_1-xZn_xTe (CZT) films were grown on glass substrates and CdCl₂ activation was applied on these films to improve their physical, optical and electrical characteristics for photodetector applications. X-ray diffraction data showed that CdCl₂ treatment of CdTe caused a reduction in the dislocation density and microstrain, whereas Zn incorporation/CdCl₂ treatment slightly increased these values compared to the as-deposited CdTe films. Morphological examination indicated that CdCl₂ activation transformed grains from faceted to rounded shape for both CdTe and CZT films. A band gap enlargement was observed from 1.45 eV to 1.47 eV for both CdTe and CZT films upon CdCl₂ treatment. CdCl₂-treated CZT films were used to fabricate photodetectors that exhibited the highest performance with a rise/fall time of 27/28 ms, sensitivity of 1301 %, responsivity of 0.0143 A/W, detectivity of 5.7x10⁷ Jones and external quantum efficiency of 4.0 % under blue light illumination at 2 V.

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来源期刊

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.