Charge Transfer State Versus Hot Exciton Dissociation in Polymer−Fullerene Blended Solar Cells
- 6 August 2010
- journal article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 132 (34), 11878-11880
- https://doi.org/10.1021/ja1045742
Abstract
We examine the significance of hot exciton dissociation in two archetypical polymer−fullerene blend solar cells. Rather than evolving through a bound charge transfer state, hot processes are proposed to convert excitons directly into free charges. But we find that the internal quantum yields of carrier photogeneration are similar for both excitons and direct excitation of charge transfer states. The internal quantum yield, together with the temperature dependence of the current−voltage characteristics, is consistent with negligible impact from hot exciton dissociation.Keywords
This publication has 24 references indexed in Scilit:
- Observation of a Charge Transfer State in Low‐Bandgap Polymer/Fullerene Blend Systems by Photoluminescence and Electroluminescence StudiesAdvanced Functional Materials, 2009
- Barrierless Free Carrier Formation in an Organic Photovoltaic Material Measured with Ultrafast Vibrational SpectroscopyJournal of the American Chemical Society, 2009
- Bulk heterojunction solar cells with internal quantum efficiency approaching 100%Nature Photonics, 2009
- Charge-Transfer Excitons at Organic Semiconductor Surfaces and InterfacesAccounts of Chemical Research, 2009
- Free Energy Control of Charge Photogeneration in Polythiophene/Fullerene Solar Cells: The Influence of Thermal Annealing on P3HT/PCBM BlendsAdvanced Functional Materials, 2008
- Coulomb Barrier for Charge Separation at an Organic Semiconductor InterfacePhysical Review Letters, 2008
- Compositional and Electric Field Dependence of the Dissociation of Charge Transfer Excitons in Alternating Polyfluorene Copolymer/Fullerene BlendsJournal of the American Chemical Society, 2008
- Charge carrier formation in polythiophene/fullerene blend films studied by transient absorption spectroscopyJournal of the American Chemical Society, 2008
- Device Physics of Polymer:Fullerene Bulk Heterojunction Solar CellsAdvanced Materials, 2007
- Formation of a Ground‐State Charge‐Transfer Complex in Polyfluorene//[6,6]‐Phenyl‐C61 Butyric Acid Methyl Ester (PCBM) Blend Films and Its Role in the Function of Polymer/PCBM Solar CellsAdvanced Functional Materials, 2007