Optical Absorption in Polymer-Derived Amorphous Silicon Oxycarbonitrides
Abstract: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.
Document Type: Research Article
Affiliations: 1: Laboratory of Excited State Process, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Science, Changchun, China 2: Advanced Materials Processing and Analysis Center, University of Central Florida, Orlando, Florida 32816
Publication date: 2009-12-01