Abstract
A constant photocurrent method (CPM) was used to determine the relative optical absorption coefficient of the C60 single crystal in the weak-absorption region. The result suggested the existence of extrinsic states in the C60 single crystal. The photoluminescence (PL) peaks of the C60 single crystal were observed at 1.48 eV and 1.65 eV these positions are different from those of C60 thin films.
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