Abstract
We have found recently that thin film layered heterojunction between C 60 and conducting polymer, like poly(3-alkylthiophene) shows a photovoltaic effect due to photoinduced charge transfer at the interface. In this work we report the method of fabrication and characterization of AI/C 60/PPP/SnO 2 junctions and examine its photoresponse. The PPP thin film have been vacuum deposited by discrete (or flash) evaporation of PPP (polyparaphenylene) powder, which allows to avoid the decomposition of polymer chains. Then C 60 was evaporated on the top of PPP film. The heterostructure showed the assymmetric I–V dependence with the rectification ratio of about 10 4 at 20V reverse bias (plus at Al-electrode). Upon illumination the drastic increase of the photocurrent has been observed at reverse bias, suggesting the possible application of this junction as a sensitive photodetector. Spectral response of the device was studied and the mechanisms of the photovoltaic effect are discussed. Contrary to conventional inorganic semiconductor p-n junction photocell, the C 60-PPP junction can be rather viewed as molecular donor-acceptor (D-A) type photocell.
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