The Influence of the Hyperfine Range Magnetic Field on Charge Transfer States at the Metal–Organic Semiconductor Interface

Kaulach, I.; Silinsh, E. A.

doi:10.1002/pssb.2220750126

Cited by 6 publications

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“…At distances less than 3.5 Å the electron clouds of planar aromatic molecules overlap in face-to-face orientation, and electron exchange interactions can become significant. , Correspondence of the F and C absorption bands to the intermolecular CT transitions is confirmed by the photocurrent quantum efficiency β( h ν) spectra (see Figure ). The intermolecular CT origin of F and C transitions is also in line with the dependence of the photocurrent quantum efficiency on the external magnetic field . That also implies that the photogeneration of free charge carriers in DMABI crystals and films actually occurs via intermolecular charge-transfer states and is of intrinsic nature.…”

Section: Discussionsupporting

confidence: 68%

Free and Self-Trapped Charge-Transfer Excitons in Crystals of Dipolar Molecules of N,N-Dimethylaminobenzylidene 1,3-Indandione

et al. 1998

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In this paper we consider the spectral properties of exciton transitions of N,N-dimethylaminobenzylidene 1,3-indandione (DMABI) films and crystals, which are typical examples of polar molecular compounds. A large dipole moment in the electronic ground state and the considerable change (up to 12 D) of this value by excitation of a free DMABI molecule induce strong polarization of the surroundings, which causes the remarkable self-trapping effects in the crystal. The exciton-phonon coupling value g ) 1.87 is estimated for the crystal. Charge-transfer (CT) exciton formation is observed in the absorption and luminescence spectra by analyzing the spectral behavior at various thicknesses of DMABI films. The CT excitons created along molecular stacks dominate in the spectra of the DMABI crystals. Coexistence of free and self-trapped CT excitons is discovered at elevated temperatures. The exciton band parameters are estimated, and the adiabatic energy potential energy for two self-trapped excitons is suggested. Relaxation paths of shallow short-lived and deeply trapped long-lived self-trapped CT excitons are discussed. Mechanisms of two-photon absorption and photoconductivity of DMABI crystals and films are considered.

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Section: Discussionsupporting

confidence: 68%