Journal
DYES AND PIGMENTS
Volume 170, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2019.107661
Keywords
Triphenylamine; 4-Hexyloxyaniline; Organic solar cell; Small molecule donor
Funding
- CSIRO Division of Manufacturing, Clayton, Victoria Australia
- Australian Research Council [FT130100057]
- Australian Research Council [FT130100057] Funding Source: Australian Research Council
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Through the molecular engineering of cyanopyrid-2,6-dione functionality, herein we report the design and synthesis of a novel, small molecule electron donor, (Z)-54(5'-(4-(diphenylamino)pheny1)42,2'-bithiophen]-5yOmethylene)-1-(4-(hexyloxy)pheny1)-4-methyl-2,6-dioxo-1,2,5,6-tetrahydropyridine-3-carbonitrile (coded as CP2), which exhibits improved optoelectronic and photovoltaic properties when compared with its structural analogue (E)-54(5.-(4-(diphenylamino)pheny1)-(2,2'-bithiopher]-5-yl)methylene)-1-(2-ethylhexyl)-4-methyl2,6-dioxo-1,2,5,6-tetrahydropyridine-3-carbonitrile (coded as CPI). The molecular engineering helps to achieve more desirable energy levels together with bathochromic shift in the absorption spectrum, which improves the short-circuit current density. A high conversion efficiency of 6.28% was obtained in simple devices (CP2: PC61BM 1: 1) which is one of the best results in the current literature for cyanopyrid-2,6-dione-based small molecule donors.
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