Abstract
The photophysical properties of thin films of poly[2-methoxy-5-(2′-ethyl-hexyloxy), para-phenylene vinylene] (MEH-PPV) on TiO 2 substrates have been investigated. Evidence for dissociation of excitons at the MEH-PPV/TiO 2 interface and electron injection into the conduction band of TiO 2 has been found from current/voltage characteristics. The open circuit voltage is to 0.92 V for these cells and an energy conversion efficiency of 0.15% is found for white light. Capacitance measurements follow the Mott–Schottky relationship and reveal an acceptor density of N A≈9×10 17 cm −3 for the polymer layers. From analysis of the luminescence as a function of the film thickness, an exciton diffusion length of 20±3 nm for MEH-PPV is derived.
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