Harvesting excitons and improving charge transport in organic-inorganic hybrid photovoltaic cells

Abstract

The authors describe the studies of exciton diffusion and charge transport in polymer-titania and polymer-alumina systems. We show that the exciton diffusion length is 12 nm in MDMO-PPV, the effective exciton diffusion length can be even larger if two polymers are used to promote efficient Forster energy transfer, and charge carrier mobilities higher than 10minus;3 cm2/Vs can be obtained in the relevant direction with regioregular poly(3-hexyl thiophene) by aligning the chains in nanopores