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Sano-Tachiya-Noolandi-Hong, Onsager and Braun models vs Monte Carlo simulation of charge photogeneration in organic solids
Abstract
The Sano-Tachiya-Noolandi-Hong (STNH), Onsager, and Braun models as well as Monte Carlo (MC) simulations of charge recombination/separation have been applied for the first time to reproduce the results of the electromodulated photoluminescence measurements in vacuum-evaporated films of fluorescent materials commonly used in optoelectronic devices. The values of the electron-hole pair final recombination speed in the monomer emitters: 4,4′,4″-tris(N-(3-methylphenyl)-N-phenylamino)triphenylamine (m-MTDATA), mer-tris(8-quinolato) aluminium (Alq3), dimer emitter, 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (bathocuproine, BCP) as well as exciplex emitter, m-MTDATA:BCP were estimated. It has been shown that the final recombination step proceeds at the finite distance of roughly one intermolecular separation which should be taken into account in any reliable description of electronic processes in given organic systems. While performance of the STNH and Onsager formalisms remains satisfactory, the Braun model should rather not be applied to a system with a strong electric-field-assisted dissociation of e-h pairs. The main results for a continuous medium were well-supported by MC simulations of diffusion on a discrete energetically ordered lattice of point molecules.
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Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
ORGANIC ELECTRONICS
no. 39,
pages 328 - 339,
ISSN: 1566-1199 - Language:
- English
- Publication year:
- 2016
- Bibliographic description:
- Grygiel P., Falkowski K., Pelczarski D., Stampor W.: Sano-Tachiya-Noolandi-Hong, Onsager and Braun models vs Monte Carlo simulation of charge photogeneration in organic solids// ORGANIC ELECTRONICS. -Vol. 39, (2016), s.328-339
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.orgel.2016.10.023
- Verified by:
- Gdańsk University of Technology
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