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SYOH: Organic and Hybrid Systems for Future Electronics

SYOH 8: Hybrid Systems

SYOH 8.2: Invited Talk

Friday, March 12, 2004, 12:40–13:10, H1

Understanding Donor-Acceptor Photovoltaic Devices — •Neil Greenham, Baoquan Sun, Henry Snaith, James Barker, Richard Friend, and Catherine Ramsdale — Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, United Kingdom

The power conversion efficiency of a polymer photovoltaic device is determined by the short-circuit quantum efficiency, the open-circuit voltage and the shape of the current-voltage curve. A high short-circuit quantum efficiency requires efficient charge separation and charge collection, and I will present photovoltaic devices based on conjugated polymers and CdSe tetrapods which provide efficient charge transport perpendicular to the plane of the film and which have solar power conversion efficiencies in excess of 3 processes which determine the open-circuit voltage in donor-acceptor devices, and will demonstrate the importance of diffusion currents in generating an additional intensity-dependent open-circuit voltage. These ideas will be applied to bilayer and blended photovoltaic devices, where numerical modelling allows the current-voltage curve to be calculated under illumination.