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Amorphous carbon (a-12C) and amorphous isotopic carbon (a-13C) films were deposited from carbon and 13C targets, respectively to investigate isotopic effects on the electronic properties of amorphous carbon films. The 13C target was obtained by sintering 13C charcoal. The structure of the films was evaluated by Raman spectroscopy. The density of paramagnetic defects was evaluated by electon spin resonance, and ultraviolet-visible spectroscopy was carried out to determine the optical band gap of the films. There were no significant differences between the graphite structures of a-12C and a-13C films. On the other hand, the defect density of the a-13C film (1.1×1020 cm-3) was more than 10 times higher than that of the a-12C film (1.0×1019 cm-3) and the Tauc gap of the a-13C film (1.9 eV) was lower than that of the a-12C film (2.1 eV). These results indicated that 13C affects the electronic properties of amorphous carbon films.

Isotopic influence on amorphous carbon films