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Electronic Structure and Dynamics at Organic Donor/Acceptor Interfaces

Published online by Cambridge University Press:  31 January 2011

Xiaoyang Zhu  and
Antoine Kahn
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Abstract

We present our understanding of the electronic energy landscape and dynamics of charge separation at organic donor/acceptor interfaces. The organic/organic interface serves as a valuable point of reference and plays an important role in emerging electronic and optoelectronic applications, particularly organic photovoltaics (OPVs). The key issue on electronic structure at organic donor/acceptor interfaces is the difference in the lowest unoccupied molecular orbitals or that in the highest occupied molecular orbitals. This difference represents an energy gain needed to overcome the exciton binding energy in a charge-separation process in OPV. A sufficiently large energy gain favors the formation of charge transfer (CT) states that are energetically close to the charge-separation state. At an organic donor/acceptor interface in an OPV device, these high-energy CT states, also called hot CT excitons, are necessary intermediates in a successful charge-separation process.

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Type
Research Article
Information
MRS Bulletin , Volume 35 , Issue 6: Electronic Properties of Organic-Based Interfaces , June 2010 , pp. 443 - 448
Copyright
Copyright © Materials Research Society 2010

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