Augulis, Ramunas ORCID: 0000-0002-8596-2334, Devizis, Andrius, Peckus, Domantas ORCID: 0000-0002-4224-2521, Gulbinas, Vidmantas, Hertel, Dirk ORCID: 0000-0002-0421-9734 and Meerholz, Klaus ORCID: 0000-0001-7450-4672 (2015). High Electron Mobility and Its Role in Charge Carrier Generation in Merocyanine/Fullerene Blends. J. Phys. Chem. C, 119 (11). S. 5761 - 5771. WASHINGTON: AMER CHEMICAL SOC. ISSN 1932-7447

Full text not available from this repository.

Abstract

Charge carrier generation and drift dynamics have been investigated in two types of dye:fullerene heterojunctions: vacuum-deposited merocyanine:C-60 and solution-processed merocyanine:PC61BM blends by combining electric-field-induced fluorescence quenching and ultrafast time-resolved carrier drift measurements. We demonstrate that interfacial charge transfer (CT) states are strongly heterogeneous with energies dependent on the acceptor material and its domain sizes. Interfacial CT states on large C-60 domains have low energies, while CT states on PC61BM domains have larger energies, which are weakly dependent on the domain sizes. We distinguish two interfacial CT state dissociation pathways: (i) ultrafast, weakly dependent on the electric field and (ii) slow field-assisted dissociation during entire CT state lifetime. We attribute process i to low-energy, weakly bound CT states on large fullerene domains and process ii to strongly bound CT states on small domains or single fullerene molecules. The electron mobility in films with 50% of C-60 is several times higher than in the films with PC61BM and orders of magnitude higher than the hole mobility. We conclude that efficient carrier generation at low electric fields typical for operating solar cells relies on unperturbed motion of highly mobile electrons; thus, fast motion and extraction of electrons are crucial for efficient solar cells.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Augulis, RamunasUNSPECIFIEDorcid.org/0000-0002-8596-2334UNSPECIFIED
Devizis, AndriusUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Peckus, DomantasUNSPECIFIEDorcid.org/0000-0002-4224-2521UNSPECIFIED
Gulbinas, VidmantasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hertel, DirkUNSPECIFIEDorcid.org/0000-0002-0421-9734UNSPECIFIED
Meerholz, KlausUNSPECIFIEDorcid.org/0000-0001-7450-4672UNSPECIFIED
URN: urn:nbn:de:hbz:38-404812
DOI: 10.1021/jp5054698
Journal or Publication Title: J. Phys. Chem. C
Volume: 119
Number: 11
Page Range: S. 5761 - 5771
Date: 2015
Publisher: AMER CHEMICAL SOC
Place of Publication: WASHINGTON
ISSN: 1932-7447
Language: English
Faculty: Faculty of Mathematics and Natural Sciences
Divisions: Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ORGANIC SOLAR-CELLS; TRANSFER EXCITONS; TRANSFER STATES; PHOTOCURRENT GENERATION; BULK HETEROJUNCTIONS; CONJUGATED POLYMER; DISSOCIATION; ENERGY; SEPARATION; FILMSMultiple languages
Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/40481

Downloads

Downloads per month over past year

Altmetric

Export

Actions (login required)

View Item View Item