Applying strong external electric field to thiophene-based oligomers A promising approach to upgrade semiconducting performance

Applying strong external electric field to thiophene-based oligomers : A promising approach to upgrade semiconducting performance

© 2016 Wiley Periodicals, Inc.

Bibliographische Detailangaben
Veröffentlicht in:Journal of computational chemistry. - 1984. - 38(2017), 5 vom: 15. Feb., Seite 304-311
1. Verfasser: Zhan, Xiaoling (VerfasserIn)
Weitere Verfasser: Shi, Hu, Liu, Hongguang, Lee, Jin Yong
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2017
Zugriff auf das übergeordnete Werk:Journal of computational chemistry
Schlagworte:Journal Article Research Support, Non-U.S. Gov't charge transport density functional theory external electric field oligothiophenes reorganization energy
Beschreibung
Zusammenfassung:© 2016 Wiley Periodicals, Inc.
A key parameter dictating the rate of charge transfer (CT) is reorganization energy (λ), an energy associated with geometry changes during hole/electron transfer. We show that "ironing" the inter-ring dihedral angles of oligothiophenes via proper substitutions or insertions (e.g., -OR, -F or -C≡C-), decreases the λ and thus promotes CT according to Marcus equation. Our results demonstrate, to attain a smaller λ, extending oligomer length is only significant if the flattened backbone structure is realized. Of great interest is that external electric fields, which are ubiquitous in electronic devices yet commonly overlooked in the computation of λ, can have a significantly greater impact than conventional substitutions. It is important to emphasize, the responses of λ to external fields is system-dependent. Compared to fused-ring conjugated systems, single-bond connected thiophenes are more sensitive to external fields. Fx lowers the λ (552 meV) of quaterthiophene by almost 80% at the intensity of 1 V/Å, down to a value (125 meV) which is even lower than that of pentacene (154 meV) and rubrene (219 meV) at the same level of theory. © 2016 Wiley Periodicals, Inc
Beschreibung:Date Completed 26.11.2018
Date Revised 26.11.2018
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1096-987X
DOI:10.1002/jcc.24684