Wang, C.-K.C.-K.WangJiang, B.-H.B.-H.JiangLu, J.-H.J.-H.LuCheng, M.-T.M.-T.ChengJeng, R.-J.R.-J.JengLu, Y.-W.Y.-W.LuChen, C.-P.C.-P.ChenKEN-TSUNG WONGRU-JONG JENG2021-01-272021-01-272020https://www.scopus.com/inward/record.url?eid=2-s2.0-85078961401&partnerID=40&md5=075f24a4872236fd44ed93695622ce45https://scholars.lib.ntu.edu.tw/handle/123456789/543300An acceptor–donor–acceptor (A–D–A)-type non-fullerene acceptor (NFA), PTTtID-Cl, featuring thieno[3,2-b]thieno[2′′′,3′′′:4′′,5′′]-pyrrolo[2′′,3′′:4′,5′]thieno[2′,3′:4,5]thieno-[2,3-d]pyrrole (DTPTt) as the electron-rich core and 2-(5,6-dichloro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile (ID-Cl) as the peripheral electron-deficient terminal group was synthesized and characterized. PTTtID-Cl exhibited strong absorption in the range of 700–850 nm in CHCl3 and redshifted absorption centered at 881 nm in a thin film. The near infrared (NIR)-absorption of PTTtID-Cl was combined with a low-bandgap polymer donor (PTB7-Th) to achieve binary and semitransparent organic photovoltaics (OPVs) with a power conversion efficiency (PCE) of 8.9 % and 7.7 % (with an average visible transmittance (AVT) of 16.7 %), respectively. A ternary device with a ratio of PM7/PTTtID-Cl/IT-4F=1:0.15:0.85 (w/w) achieved a short-circuit current density of 19.46 mA cm−2, an open-circuit voltage of 0.87 V, and a fill factor of 71.2 %, giving a PCE of 12.0 %. In addition, by employing the Ag/ITO/Ag microcavity structure, semitransparent colorful binary organic photovoltaics (OPVs) with superior transparency of 27.9 % at 427 nm and 22.7 % at 536 nm for blue and green devices, respectively, were prepared. The semitransparent colorful devices based on the optimized ternary blend gave PCEs of 8.7 %, 8.4 %, and 9.1 % for blue, green, and red devices, respectively. These results indicate the promising potential of PTTtID-Cl as a NIR-absorption NFA for applications in semitransparent colorful binary and ternary OPVs. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim[SDGs]SDG7Fullerenes; Infrared devices; Light absorption; Open circuit voltage; acceptors; conjugation; donors; non-fullerene acceptor; Organic photovoltaics; Chlorine compoundsjournal article10.1002/cssc.201903087318995952-s2.0-85078961401WOS:000510774600001