Abstract
The optical and electrical energy gaps of low-temperature glassy carbon obtained from polyfurfuryl alcohol in the range of heat-treatment temperature HTT=300–800 °C have been compared. Optical absorption were measured in the energy range of 0.4–3.5 eV. The optical energy gap is 1.8 eV for samples heat-treated at 300 °C and decreases with HTT to 0.05 for HTT=800 °C. The mobility gap changes from 1.2 to 0.08 eV in the range of HTT=400–700 °C. The differences between the optical and the electrical energy gaps apparently decreases with increasing HTT. These results support the suggestion that in the low-temperature glassy carbon a large number of localized states exist, the band edges of the valence and conduction bands are not sharp and deviations from the Tauc plot for the optical absorption may exist.
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