Abstract
A dynamic model for the intensity modulated photocurrent spectroscopy (IMPS) of bilayer polymer/TiO2 photovoltaic cells is developed in consideration of the exciton generation in the polymer layer, exciton diffusion to the polymer/TiO2 interface, electron injection into the TiO2 layer, and electron diffusion through the TiO2 layer; particularly, the phase shift ϕn(ω) due to the time delay between exciton generation and dissociation is included in the continuity equations for electron transport. Bilayer polymer/TiO2 cells consisting of poly(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene vinylene) (MEH-PPV) and nanostructured TiO2 were prepared for experimental purposes, with a TiO2 layer thickness d of 120 and 65 nm. Experimental data obtained confirm all the main expectations of the model, providing important information on incident photon-to-current conversion efficiency (IPCE), exciton dissociation, and electron transport. The frequency-dependent ϕn(ω) affects the location (Phigh) where IMPS response cross...
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