Universität zu Köln

Devizis, A., Hertel, D., Meerholz, K., Gulbinas, V. and Moser, J. -E. (2014). Time-independent, high electron mobility in thin PC61BM films: Relevance to organic photovoltaics. Org. Electron., 15 (12). S. 3729 - 3735. AMSTERDAM: ELSEVIER. ISSN 1878-5530

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Abstract

Ultrafast optical probing of electric field by means of electroabsorption combined with conventional photocurrent measurements was employed to investigate the drift and mobility dynamics of photo-generated charge carriers in the pristine PC61BM film and in the blend with a merocyanine dye. Electrons passed a 40 nm thick PC61BM film within a few picoseconds with time-independent and weakly dispersive mobility. The electron mobility is 1 cm(2)/(V s) at 1 MV/cm and an estimate of the zero-field mobility yields 5 . 10(-2) cm(2)/(V s). The initial electron mobility in the blend is of the order of 10(-2) cm(2)/(V s) and decreases rapidly. We conclude that electron motion in PC61BM based organic bulk hetero-junction solar cells is limited by barriers between PC61BM domains rather than by intrinsic PC61BM properties. (C) 2014 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Devizis, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hertel, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Meerholz, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gulbinas, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Moser, J. -E. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-421863
DOI:	10.1016/j.orgel.2014.10.028
Journal or Publication Title:	Org. Electron.
Volume:	15
Number:	12
Page Range:	S. 3729 - 3735
Date:	2014
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1878-5530
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FIELD-EFFECT TRANSISTORS; CHARGE-TRANSPORT; CONJUGATED POLYMER; PHOTOCONDUCTIVITY; SPECTROSCOPY; ABSORPTION; DEPENDENCE; SEPARATION; STATES Multiple languages Materials Science, Multidisciplinary; Physics, Applied Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42186