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Does Electron Delocalization Influence Charge Separation at Donor–Acceptor Interfaces in Organic Photovoltaic Cells?

Title data

Kahle, Frank-Julian ; Saller, Christina ; Olthof, Selina ; Li, Cheng ; Lebert, Jenny ; Weiß, Sebastian ; Herzig, Eva M. ; Hüttner, Sven ; Meerholz, Klaus ; Strohriegl, Peter ; Köhler, Anna:
Does Electron Delocalization Influence Charge Separation at Donor–Acceptor Interfaces in Organic Photovoltaic Cells?
In: The Journal of Physical Chemistry C. Vol. 38 (2018) Issue 122 . - pp. 21792-21802.
ISSN 1932-7455
DOI: https://doi.org/10.1021/acs.jpcc.8b06429

Abstract in another language

We use bilayer devices with a series of three fullerene acceptors differing in order and intermolecular coupling to systematically explore the influence of electron delocalization in the acceptor phase on the dissociation efficiency of charge transfer states. Structural information from GIWAXS measurements is combined with the results of optical and electrical characterization as well as theoretical modeling. Our results indicate that an increase in CT-dissociation efficiency is directly coupled to an enhancement in electron delocalization that is particularly prominent for C60 which forms crystalline domains. Therefore, our results substantiate the concept of delocalization of electrons taking a positive role in the charge separation process, and of acceptor crystallinity being crucial in this respect.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Juniorprofessur Experimentalphysik VII - Dynamik und Strukturbildung
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Juniorprofessur Experimentalphysik VII - Dynamik und Strukturbildung > Juniorprofessur Experimentalphysik VII - Dynamik und Strukturbildung - Juniorprof. Dr. Eva Maria Herzig
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 28 Feb 2019 12:57
Last Modified: 13 Jun 2019 12:32
URI: https://eref.uni-bayreuth.de/id/eprint/47662