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Semiconductor Physics, Quantum Electronics & Optoelectronics. 2006. V. 9, N 4. P. 021-025.
Photoabsorption and photoconductivity in C60 layers
Central Laboratory of Solar Energy and New Energy Sources, Bulgarian Academy of Sciences
72, “Tzarigradsko chaussee” blvd, 01784 Sofia, Bulgaria
Phone: +3592778448, fax: +35928754016
Abstract. A complex investigation of the photoconductivity of fullerene films, prepared
by thermal evaporation in vacuum, was carried out. The investigated films contain
predominantly C60 in various phases as shown elsewhere. The multiple photocurrent
spectra analysis (MPSA method) has been used in the current study. The MPSA method
utilizes a family of routine photocurrent spectra, measured at various intensities
generated by the light source. A suitable data processing of such a family allowed several
basic characteristics of the films to be obtained – the optical bandgap, subbandgap optical
absorption spectra, features of shallow and deep defect states as well as the spectra of the
power index in the dependence of the photocurrent on the photon flux. These
characteristics were interpreted in terms of structural features of the investigated samples.
Conclusions about applications of such C60 films were made.
Keywords: photoconductivity, C60 fullerene, optical absorption.
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