Journal
ORGANIC ELECTRONICS
Volume 20, Issue -, Pages 76-88Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2015.01.033
Keywords
Fluoro-isoindigo; Small molecule; Propeller-like; Organic solar cells; Bulk heterojunction
Funding
- ORGANEXT [EMR INT4-1.2-2009-04/054]
- Science Policy Office of the Belgian Federal Government [IAP 7/05]
- European Commission/Region Wallonne (FEDER - Smartfilm RF project)
- FNRS-FRFC
- OPTI2-MAT excellence program (Region Wallonne)
- Agency for Innovation by Science and Technology in Flanders (IWT)
- LTQ Orbitrap Velos Pro mass spectrometer
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Two donor-acceptor type fluoro-isoindigo based small molecule semiconductors are synthesized and their optical, electrochemical, thermal, and charge transport properties are investigated. The two molecular chromophores differ by their architecture, linear (M1) vs propeller-like (M2). Both molecules present a broad absorption in the visible range and a low optical HOMO-LUMO gap (similar to 1.6 eV). AFM images of solution-processed thin films show that the trigonal molecule M2 forms highly oriented fibrils after a few seconds of solvent vapor annealing. The materials are evaluated as electron donor components in bulk heterojunction organic solar cells using PC61BM as the electron acceptor. The devices based on the propeller-like molecule M2 exhibit a high open-circuit voltage (around 1.0 V) and a power conversion efficiency of 2.23%. (C) 2015 Elsevier B.V. All rights reserved.
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