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Title: | Comparative study on the effects of alkylsilyl and alkylthio side chains on the performance of fullerene and non-fullerene polymer solar cells | Authors: | Genene, Zewdneh Negash, Asfaw Abdulahi, Birhan A. THIRUVALLUR EACHAMBADI, Ragha Liu, Zhen Van den Brande, Niko D'HAEN, Jan Wang, Ergang VANDEWAL, Koen MAES, Wouter MANCA, Jean Mammo, Wendimagegn Admassie, Shimelis |
Issue Date: | 2020 | Publisher: | ELSEVIER | Source: | ORGANIC ELECTRONICS, 77 (Art N° 105572) | Abstract: | Two novel high gap donor polymers - PBDTTSi-TzBI and PBDTTS-TzBI, based on imide-fused benzotriazole (TzBI) with asymmetric side chains and alkylsilyl (Si) or alkylthio (5) substituted 4,8-di(thien-2-yl)benzo-[1,2-b:4,5-b']dithiophene (BDTT) - are successfully synthesized. The effect of the side chain variation on the photophysical, morphological and photovoltaic properties of blends of these polymers with fullerene and non-fullerene acceptors is investigated. The PBDTTSi-TzBI polymer shows a deeper highest occupied molecular orbital energy level, which results in higher open-circuit voltages. Nevertheless, the polymer solar cells fabricated using PBDTTS-TzBI in combination with PC71BM afford a higher power conversion efficiency of 7.3% (vs 4.0% for PBDTTSi-TzBI:PC71BM). By using the non-fullerene acceptor ITIC, the absorption of the blends extends to 850 nm and better device efficiencies are achieved, 6.9% and 9.6% for PBDTTSi-TzBI:ITIC and BDTTS-TzBI: ITIC, respectively. The better performance of the PBDTTS-TzBI:ITIC-based devices is attributed to the strong and broad absorption and balanced charge transport, and is among the best performances reported for non-fullerene solar cells based on TzBI-containing polymer donors. | Notes: | Negash, A (reprint author), Addis Ababa Univ, Dept Chem, POB 33658, Addis Ababa, Ethiopia.; Negash, A; Maes, W (reprint author), Hasselt Univ, Inst Mat Res IMO IMOMEC, Agoralaan 1,Bldg D, B-3590 Diepenbeek, Belgium. asfaw.negashassegde@uhasselt.be; wouter.maes@uhasselt.be |
Other: | Negash, A (reprint author), Addis Ababa Univ, Dept Chem, POB 33658, Addis Ababa, Ethiopia; Hasselt Univ, Inst Mat Res IMO IMOMEC, Agoralaan 1,Bldg D, B-3590 Diepenbeek, Belgium. asfaw.negashassegde@uhasselt.be; wouter.maes@uhasselt.be | Keywords: | High gap polymers;Organic photovoltaics;Side chain optimization;Alkylthio;Alkylsilyl;Non-fullerene solar cells | Document URI: | http://hdl.handle.net/1942/31260 | ISSN: | 1566-1199 | e-ISSN: | 1878-5530 | DOI: | 10.1016/j.orgel.2019.105572 | ISI #: | WOS:000517965600007 | Rights: | 2019 Elsevier B.V. All rights reserved. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2021 |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
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genene.pdf Restricted Access | Published version | 2.27 MB | Adobe PDF | View/Open Request a copy |
Revised manuscript Asfaw Negash et al.pdf | Peer-reviewed author version | 1.45 MB | Adobe PDF | View/Open |
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