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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/19853

Title: Branched and linear A(2)-D-A(1)-D-A(2) isoindigo-based solution-processable small molecules for organic field-effect transistors and solar cells
Authors: Tomassetti, Mirco
Ouhib, Farid
Cardinaletti, Ilaria
Verstappen, Pieter
Salleo, Alberto
Jerome, Christine
Manca, Jean
Maes, Wouter
Detrembleur, Christophe
Issue Date: 2015
Citation: RSC ADVANCES, 5 (104), p. 85460-85469
Abstract: To establish a correlation between the molecular structure, physicochemical properties, thin film morphology, charge carrier mobility and photovoltaic performance of isoindigo-based electron donor type molecular semiconductors, a series of branched and linear A(2)-D-A(1)-D-A(2) small molecules (A = acceptor, D = donor) are synthesized. The extended p-conjugated molecular chromophores have an electron-accepting isoindigo core, a bridging oligothiophene electron donor part and terminal octyl cyanoacrylate acceptor moieties. Their photophysical, thermal and electrochemical properties are analysed and the materials are applied in organic field-effect transistors and bulk heterojunction organic solar cells. Compared to an analogous benzothiadiazole-based small molecule, the isoindigo core deepens the HOMO energy level, enabling higher open-circuit voltages in organic solar cells. The linear isoindigo-based small molecule shows an enhanced hole mobility compared to the branched derivatives. The best power conversion efficiency of the investigated set is also obtained for the solar cell based on the linear (CA-3T-IID-3T-CA-l) donor molecule in combination with PC71BM.
Notes: [Tomassetti, Mirco; Ouhib, Farid; Jerome, Christine; Detrembleur, Christophe] Univ Liege Ulg, CERM, Dept Chem, B-40009 Liege, Belgium. [Tomassetti, Mirco; Verstappen, Pieter; Maes, Wouter] Hasselt Univ, Inst Mat Res IMO IMOMEC, DSOS, B-3590 Diepenbeek, Belgium. [Tomassetti, Mirco; Cardinaletti, Ilaria] Hasselt Univ, Div Mat Phys, B-3590 Diepenbeek, Belgium. [Salleo, Alberto] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA. [Manca, Jean] Hasselt Univ, X Lab, B-3590 Diepenbeek, Belgium. [Maes, Wouter] IMEC, IMOMEC, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/19853
DOI: 10.1039/C5RA17660C
ISI #: 000363179900037
ISSN: 2046-2069
Category: A1
Type: Journal Contribution
Validation: ecoom, 2016
Appears in Collections: Research publications

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