- Title
- Novel high band gap pendant-borylated carbazole polymers with deep HOMO levels through direct ⁺N=B⁻ interaction for organic photovoltaics
- Creator
- Brandt, Rasmus G.; Sveegaard, Steffen G.; Yu, Donghong; Xiao, Manjun; Yue, Wei; Du, Zhengkun; Qiu, Meng; Angmo, Dechan; Andersen, Thomas R.; Krebs, Frederik C.; Yang, Renqiang
- Relation
- Journal of Materials Chemistry C Vol. 4, Issue 20, p. 4393-4401
- Publisher Link
- http://dx.doi.org/10.1039/c6tc01208f
- Publisher
- Royal Society of Chemistry
- Resource Type
- journal article
- Date
- 2016
- Description
- In this communication, we investigate the direct and still conjugated intramolecular ⁺N=B⁻ interactions in novel high band gap borylated carbazole containing polymers, namely, poly(3,6-(N-di(2,4,6-trimethyl)phenylboryl-carbazole)-alt-4,8-di(5-(2-ethylhexyl)thiophene-2-yl)benzo[1,2-b:4,5-b']dithiophene) (P(3,6-BCBDT)) and poly(3,6-(N-di(2,4,6-trimethyl)phenylboryl-carbazole)-alt-3,3'''-didodecyl-2,2':5',2'':5'',2'''-quaterthiophene) (P(3,6-BCQT)), which result in ambipolarity, high electron affinity, and deep HOMO levels. The quasi-donor-acceptor nature of the two polymers was confirmed by UV-Vis absorption, electro-chemical property studies, and computer modelling. Band gaps of 2.07 eV for P(3,6-BCBDT) and 2.23 eV for P(3,6-BCQT) were obtained. P(3,6-BCQT) afforded a power conversion efficiency of 1.44%, with a Jsc of 4.82 mA cm⁻², a Voc of 0.79 V and a FF of 37%, and P(3,6-BCBDT) performed better with an efficiency of 3.82%, with a Jsc of 8.31 mA cm⁻², a Voc of 1.0 V based on its low lying HOMO level, and a FF of 45%.
- Subject
- ⁺NQB⁻; organic photovoltaics; polymers
- Identifier
- http://hdl.handle.net/1959.13/1324183
- Identifier
- uon:24976
- Identifier
- ISSN:2050-7534
- Language
- eng
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