Journal Article

PUBDB-2014-04177

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Influence of the Position of the Side Chain on Crystallization and Solar Cell Performance of DPP-Based Small Molecules

Gevaerts, V. S. (Corresponding Author) ; Herzig, E.Extern* ; Kirkus, M. ; Hendriks, K. H. ; Wienk, M. M. ; Perlich, J.Extern* ; Müller-Buschbaum, P.Extern* ; Janssen, R. A. J.

2014
American Chemical Society Washington, DC

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Please use a persistent id in citations: doi:10.1021/cm4034484

Abstract: Three isomeric π-conjugated molecules basedon diketopyrrolopyrrole and bithiophene (DPP2T) substitutedwith hexyl side chains in different positions areinvestigated for use in solution-processed organic solar cells.Efficiencies greater than 3% are obtained when a mildannealing step is used. The position of the side chains onthe DDP2Ts has a major influence on the optical andelectronic properties of these molecules in thin semicrystallinefilms. By combining optical absorption and fluorescencespectroscopy, with microscopy (AFM and TEM) andscattering techniques (GIWAXS and electron diffraction), we find that the position of the side chains also affects themorphology and crystallization of these DPP2Ts when they are combined with a C70 fullerene derivative in a thin film. The studydemonstrates that changing the side chain position is an additional, yet complex, tool to influence behavior of conjugatedmolecules in organic solar cells.KEYWORDS: small molecules, solar cells, side chain engineering, morphology, crystallinity

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Contributing Institute(s):

1. DOOR-User (DOOR)

Research Program(s):

1. DORIS Beamline BW4 (POF2-54G13) (POF2-54G13)

Experiment(s):

1. DORIS Beamline BW4 (DORIS III)

Appears in the scientific report 2014

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Database coverage:
; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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