Experimental Determination of the Excited-State Polarizability and Dipole Moment in a Thin Organic Semiconductor Film

Steele, Mary P.; Blumenfeld, Michael L.; Monti, Oliver L.A.

doi:10.1021/jz1006466

Experimental Determination of the Excited-State Polarizability and Dipole Moment in a Thin Organic Semiconductor Film

Journal Article · · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/jz1006466· OSTI ID:1064768

Steele, Mary P.; Blumenfeld, Michael L.; Monti, Oliver L.A.

We report the evolution of the electronic structure of excited (sub)monolayer films of vanadyl naphthalocyanine (VONc) at the interface with highly oriented pyrolytic graphite (HOPG). Using two-photon photoemission spectroscopy, an unoccupied state corresponding to the lowest unoccupied molecular orbital of VONc is observed. The energy of this state shows a significant dependence on coverage, interpreted in the context of the electrostatic environment at the interface. On the basis of a simple electrostatic model, we were able to determine the excited-state polarizability and dipole moment of VONc at the interface with HOPG. The results suggest that local electric fields may have a major influence on interfacial energy level alignment in the excited-state manifold, with direct consequences for interfacial charge-transfer dynamics

Research Organization:: Energy Frontier Research Centers (EFRC); Center for Interface Science: Solar Electric Materials (CISSEM)

Sponsoring Organization:: USDOE SC Office of Basic Energy Sciences (SC-22)

DOE Contract Number:: SC0001084

OSTI ID:: 1064768

Journal Information:: Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 13 Vol. 1(13); ISSN 1948-7185

Country of Publication:: United States

Language:: English

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Experimental Determination of the Excited-State Polarizability and Dipole Moment in a Thin Organic Semiconductor Film

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