Premium
Optical Absorption in Polymer‐Derived Amorphous Silicon Oxycarbonitrides
Author(s) -
Wang Yansong,
Jiang Tao,
Zhang Ligong,
An Linan
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03333.x
Subject(s) - delocalized electron , materials science , amorphous solid , absorption (acoustics) , silicon , absorption spectroscopy , band gap , spectral line , polymer , amorphous silicon , absorption band , thermal decomposition , analytical chemistry (journal) , optoelectronics , chemistry , crystalline silicon , optics , crystallography , composite material , organic chemistry , physics , astronomy
Three amorphous silicon oxycarbonitrides are prepared by thermal decomposition of a polymeric precursor at different temperatures. The optical absorption spectra of these materials are measured over a wide range of excitation energies from 0.4 to 5.0 eV. The spectra are analyzed using theoretical models. Two absorption transitions are identified between the deep defect energy level and the delocalized conduction band and between the two delocalized bands. It is found that the band gaps measured decrease with increasing pyrolysis temperature. The results obtained are discussed.