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Sub-picosecond exciton dynamics at CuPc/C60 interfaces: Energy dependence of exciton dissociation

Published

Author(s)

Steven W. Robey

Abstract

Donor-acceptor interfaces are critical for the operation of organic photovoltaic devices. Exciton dynamics, leading to charge separation and recombination at these interfaces, play a significant role in determining efficiency, potentially controlling open circuit voltage (VOC), short circuit current (JSC), and\or fill factor (FF). Dynamics at the interface are in turn dependent on the interfacial electronic and molecular structure. We use time-resolved two-photon photoemission (TR-2PPE) to investigate exciton dissociation, recombination, and relaxation processes occurring at well-characterized prototypical donor-acceptor interfaces formed by controlled growth of copper phthalocyanine (CuPc) layers on C60. TR-2PPE measurements as a function of CuPc thickness, starting with a single layer, provide a picture of sub-picosecond charge separation and recombination processes as a function of distance from the CuPc/C60 interface.
Citation
Journal of Physical Chemistry

Keywords

Organic photovoltaics, donor-acceptor, interface, time-resolved photoemission, exciton dynamics

Citation

Robey, S. (2012), Sub-picosecond exciton dynamics at CuPc/C60 interfaces: Energy dependence of exciton dissociation, Journal of Physical Chemistry (Accessed February 27, 2024)
Created September 13, 2012, Updated February 19, 2017