Optical properties of swift ion beam irradiated CdTe thin films

S. Chandramohan, R. Sathyamoorthy, P. Sudhagar, D. Kanjilal, D. Kabiraj, K. Asokan

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

This paper reports the effect of swift (80 MeV) oxygen (O+6) ion irradiation on the optical properties of CdTe thin films grown by conventional thermal evaporation on glass substrates. The films are found to be slightly Te-rich in composition and irradiation results no change in the elemental composition. The optical constants such as refractive index (n), absorption coefficient (α) and the optical band gap energy show significant variation in their values with increase in ion fluence. Upon irradiation the band gap energy decreased from a value of 1.53 eV to 1.46 eV whereas the refractive index (n) increased from 2.38 to 3.12 at λ = 850 nm. The photoluminescence spectrum shows high density of native defects whose density strongly depends on the ion fluence. Both analyses indicate considerable defect production after swift ion beam irradiation.

Original languageEnglish
Pages (from-to)5508-5512
Number of pages5
JournalThin Solid Films
Volume516
Issue number16
DOIs
Publication statusPublished - 30 Jun 2008

Keywords

  • Band gap energy
  • CdTe films
  • Defect creation
  • Ion irradiation
  • Optical constants
  • Photoluminescence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Optical properties of swift ion beam irradiated CdTe thin films'. Together they form a unique fingerprint.

Cite this