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http://hdl.handle.net/1942/28228
Title: | Homocoupling defects in porphyrinoid small molecules and their effect on organic solar cell performance | Authors: | KELCHTERMANS, Mathias DECKERS, Jasper BREBELS, Jeroen KESTERS, Jurgen VERSTAPPEN, Pieter THIRUVALLUR EACHAMBADI, Ragha Liu, Zhen Van den Brande, Niko MANCA, Jean LUTSEN, Laurence VANDERZANDE, Dirk MAES, Wouter |
Issue Date: | 2019 | Source: | Organic Electronics, 69, p. 48-55 | Abstract: | Porphyrinoid small molecules can be used as electron donor or acceptor components in bulk heterojunction organic solar cells, which has resulted in steadily improving power conversion efficiencies. However, the effect of material purity is often neglected. In this work, a series of D1-A-π-D2-π-A-D1 conjugated chromophores based on the A2B2-meso-ethynylporphyrin core is synthesized. Different electron-donating (D1) end groups are chosen to investigate their influence on the material properties and optoelectronic characteristics. The porphyrin small molecules are tested as electron donor materials in bulk heterojunction organic solar cells in combination with PC71BM, affording an efficiency up to 4.6% under standard illumination. Furthermore, it is shown that (Glaser type) homocoupled side products are generated during the final Sonogashira cross-coupling reactions, which can be very challenging to remove. Their presence reduces solar cell performance by affecting the open-circuit voltage and fill factor. | Notes: | Maes, W (reprint author), UHasselt Hasselt Univ, Inst Mat Res IMO, DSOS, B-3590 Diepenbeek, Belgium. wouter.maes@uhasselt.be | Keywords: | Porphyrins; Conjugated small molecules; Organic photovoltaics; Material purity; Homocoupling; Glaser | Document URI: | http://hdl.handle.net/1942/28228 | Link to publication/dataset: | https://www.sciencedirect.com/science/article/pii/S1566119919301132 | ISSN: | 1566-1199 | e-ISSN: | 1878-5530 | DOI: | 10.1016/j.orgel.2019.03.012 | ISI #: | 000466385800008 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2020 |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
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Keltchermans.pdf Restricted Access | Published version | 1.33 MB | Adobe PDF | View/Open Request a copy |
Keltchermans supp.pdf Restricted Access | Supplementary material | 2.22 MB | Adobe PDF | View/Open Request a copy |
10.1016@j.orgel.2019.03.012.pdf | Peer-reviewed author version | 1.7 MB | Adobe PDF | View/Open |
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