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

Yılmaz S., Başol B., POLAT İ., Daday M., TOMAKİN M., KÜÇÜKÖMEROĞLU T., ...Daha Fazla

Materials Science and Engineering: B, cilt.317, 2025 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 317
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1016/j.mseb.2025.118208
  • Dergi Adı: Materials Science and Engineering: B
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: CdCl2 treatment, CdTe and CZT thin films, CSS, Photodetector
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

Close space sublimated CdTe and Cd1-xZnxTe (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.