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Effect of heat treatment on the optical absorption of tin diselenide thin films
Author(s) -
Bhatt V. P.,
Gireesan K.,
Desai C. F.
Publication year - 1990
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170250219
Subject(s) - diselenide , band gap , thin film , tin , annealing (glass) , materials science , direct and indirect band gaps , absorption (acoustics) , stoichiometry , analytical chemistry (journal) , chemistry , optoelectronics , metallurgy , nanotechnology , composite material , selenium , chromatography
Optical absorption measurements were made on tin diselenide thin films grown on glass substrates by thermal evaporation of stoichiometric bulk compound. In the as‐deposited films, optical absorption was dominated by an indirect transition at lower photon energies with a band gap of 1.4 eV. The direct allowed transition with a band gap of 1.62 eV was predominant at higher energies. Annealing the film at elevated temperatures resulted in the decrease of both the direct and indirect transition band gaps.