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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/21546

Title: Impact of structure and homo-coupling of the central donor unit of small molecule organic semiconductors on solar cell performance
Authors: Verstappen, Pieter
Cardinaletti, Ilaria
Vangerven, Tim
Vanormelingen, Wouter
Verstraeten, Frederik
Lutsen, Laurence
Vanderzande, Dirk
Manca, Jean
Maes, Wouter
Issue Date: 2016
Citation: RSC ADVANCES, 6 (38), p. 32298-32307
Abstract: Currently, both low bandgap conjugated polymers and small molecule analogues are employed as electron donor components in state of the art bulk heterojunction organic photovoltaics, providing similar record efficiencies (similar to 10%). However, to evaluate molecular structure-device performance relations and (in particular) the effect of material purity, small molecule chromophores can be considered to be more versatile probes. In the present study, we have synthesized three small molecule donor materials with a varying central electron-rich building block, inspired by the well-known high-performance small molecule p-DTS(FBTTh2)(2). The influence of this structural modification on the physicochemical material properties, electro-optical characteristics and solar cell performance is analysed. Most importantly, it is shown that the presence of homo-coupled side products generated during Stille cross-coupling reactions - which can be very hard to remove, even for small molecule semiconductors - is detrimental to solar cell performance, with a noticeable effect on the open-circuit voltage.
Notes: [Verstappen, Pieter; Vanormelingen, Wouter; Verstraeten, Frederik; Lutsen, Laurence; Vanderzande, Dirk; Maes, Wouter] Hasselt Univ, Inst Mat Res IMO IMOMEC, Design & Synth Organ Semicond DSOS, Univ Campus,Agoralaan Bldg D, B-3590 Diepenbeek, Belgium. [Cardinaletti, Ilaria; Vangerven, Tim] Hasselt Univ, Inst Mat Res IMO IMOMEC, Mat Phys Div, Univ Campus,Wetenschapspk 1, B-3590 Diepenbeek, Belgium. [Lutsen, Laurence; Vanderzande, Dirk; Maes, Wouter] IMOMEC, IMEC, Univ Campus,Wetenschapspk 1, B-3590 Diepenbeek, Belgium. [Manca, Jean] Hasselt Univ, X LaB, Univ Campus,Agoralaan Bldg D, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/21546
DOI: 10.1039/c6ra06146j
ISI #: 000373685500085
ISSN: 2046-2069
Category: A1
Type: Journal Contribution
Validation: ecoom, 2017
Appears in Collections: Research publications

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