Universität zu Köln

Serbenta, Almis, Kozlov, Oleg V., Portale, Giuseppe ORCID: 0000-0002-4903-3159, van Loosdrecht, Paul H. M. ORCID: 0000-0002-3704-9890 and Pshenichnikov, Maxim S. (2016). Bulk heterojunction morphology of polymer: fullerene blends revealed by ultrafast spectroscopy. Sci Rep, 6. LONDON: NATURE PUBLISHING GROUP. ISSN 2045-2322

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Abstract

Morphology of organic photovoltaic bulk heterojunctions (BHJs) - a nanoscale texture of the donor and acceptor phases - is one of the key factors influencing efficiency of organic solar cells. Detailed knowledge of the morphology is hampered by the fact that it is notoriously difficult to investigate by microscopic methods. Here we all-optically track the exciton harvesting dynamics in the fullerene acceptor phase from which subdivision of the fullerene domain sizes into the mixed phase (2-15 nm) and large (>50 nm) domains is readily obtained via the Monte-Carlo simulations. These results were independently confirmed by a combination of X-ray scattering, electron and atomic-force microscopies, and time-resolved photoluminescence spectroscopy. In the large domains, the excitons are lost due to the high energy disorder while in the ordered materials the excitons are harvested with high efficiency even from the domains as large as 100 nm due to the absence of low-energy traps. Therefore, optimizing of blend nanomorphology together with increasing the material order are deemed as winning strategies in the exciton harvesting optimization.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Serbenta, Almis UNSPECIFIED UNSPECIFIED UNSPECIFIED Kozlov, Oleg V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Portale, Giuseppe UNSPECIFIED orcid.org/0000-0002-4903-3159 UNSPECIFIED van Loosdrecht, Paul H. M. UNSPECIFIED orcid.org/0000-0002-3704-9890 UNSPECIFIED Pshenichnikov, Maxim S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-255827
DOI:	10.1038/srep36236
Journal or Publication Title:	Sci Rep
Volume:	6
Date:	2016
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	2045-2322
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ORGANIC SOLAR-CELLS; EXCITON DIFFUSION; CHARGE PHOTOGENERATION; CONJUGATED POLYMER; ELECTRON-TRANSFER; DYNAMICS; DISSOCIATION; RECOMBINATION; ABSORPTION; NANOSTRUCTURE Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25582