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Title: Steric Control of the Donor/Acceptor Interface: Implications in Organic Photovoltaic Charge Generation
Authors: Holcombe, Thomas W.
Norton, Joseph E.
Rivnay, Jonathan
Woo, Claire H.
GORIS, Ludwig 
Piliego, Claudia
Griffini, Gianmarco
Sellinger, Alan
Bredas, Jean-Luc
Salleo, Alberto
Frechet, Jean M. J.
Issue Date: 2011
Source: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 133(31). p. 12106-12114
Abstract: The performance of organic photovoltaic (OPV) devices is currently limited by modest short-circuit current densities. Approaches toward improving this output parameter may provide new avenues to advance OPV technologies and the basic science of charge transfer in organic semiconductors. This work highlights how steric control of the charge separation interface can be effectively tuned in OPV devices. By introducing an octylphenyl substituent onto the investigated polymer backbones, the thermally relaxed charge-transfer state, and potentially excited charge-transfer states, can be raised in energy. This decreases the barrier to charge separation and results in increased photocurrent generation. This finding is of particular significance for nonfullerene OPVs, which have many potential advantages such as tunable energy levels and spectral breadth, but are prone to poor exciton separation efficiencies. Computational, spectroscopic, and synthetic methods were combined to develop a structure-property relationship that correlates polymer substituents with charge-transfer state energies and, ultimately, device efficiencies.
Notes: [Holcombe, TW; Frechet, JMJ] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA [Woo, CH; Frechet, JMJ] Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA [Woo, CH; Piliego, C; Griffini, G; Frechet, JMJ] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA [Frechet, JMJ] King Abdullah Univ Sci & Technol, Thuwal 239556900, Saudi Arabia [Rivnay, J; Goris, L; Sellinger, A; Salleo, A] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA [Norton, JE; Bredas, JL] Georgia Inst Technol, Ctr Organ Photon & Elect, Atlanta, GA 30332 USA [Norton, JE; Bredas, JL] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA [Goris, L] Hasselt Univ, Inst Mat Res IMO, Diepenbeek, Belgium [Griffini, G] Politecn Milan, Dept Chem, I-20133 Milan, Italy
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ISSN: 0002-7863
e-ISSN: 1520-5126
DOI: 10.1021/ja203235z
ISI #: 000293768400055
Category: A1
Type: Journal Contribution
Validations: ecoom 2012
Appears in Collections:Research publications

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