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Pentacene Excitons in Strong Electric Fields

Pentacene Excitons in Strong Electric Fields

Klaus Kuhnke, Volodymyr Turkowski, Alexander Kabakchiev, Theresa Lutz, Talat S Rahman, Klaus Kern

Chemphyschem. 2018 Feb 5;19(3):277-283.

PMID: 29240984

Abstract:

Electroluminescence spectroscopy of organic semiconductors in the junction of a scanning tunneling microscope (STM) provides access to the polarizability of neutral excited states in a well-characterized molecular geometry. We study the Stark shift of the self-trapped lowest singlet exciton at 1.6 eV in a pentacene nanocrystal. Combination of density functional theory (DFT) and time-dependent DFT (TDDFT) with experiment allows for assignment of the observation to a charge-transfer (CT) exciton. Its charge separation is perpendicular to the applied field, as the measured polarizability is moderate and the electric field in the STM junction is strong enough to dissociate a CT exciton polarized parallel to the applied field. The calculated electric-field-induced anisotropy of the exciton potential energy surface will also be of relevance to photovoltaic applications.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP135488	Pentacene		135-48-8	Price

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