Photovoltaic heterostructure devices made of sequentially adsorbed poly(phenylene vinylene) and functionalized C[sub 60]

Mattoussi, H.; Rubner, M. F.; Rubner, M.F.; Zhou, F.; Kumar, J.; Tripathy, S. K.; Tripathy, S.K.; Chiang, L. Y.; Chiang, L.Y.
September 2000
Applied Physics Letters;9/4/2000, Vol. 77 Issue 10
Academic Journal
We report on the preparation and characterization of rectifying photovoltaic heterostructure devices made of poly(phenylene vinylene), PPV, and C[sub 60]. The heterojunctions were built from solution using the technique of layer-by-layer sequential adsorption. This technique permits one to control the heterostructure at the molecular scale. Upon illumination with a laser beam, the devices showed large photoresponses (current and voltage) that resulted from a photoinduced electron transfer between the PPV (donor layer) and the C[sub 60] (acceptor layer). The photocurrent was found to increase with the laser power and with the photon energy of the incident radiation. Also, a constant high photovoltage response of ∼700-800 mV was measured. Analysis of the time dependence of the photocurrent rise and decay, when the device was illuminated with a modulated square wave signal (chopped laser beam), permitted us to draw an analogy between the present heterojunction and a circuit made of a capacitor and a resistance in series. © 2000 American Institute of Physics.


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