Yang, Y.-L.Y.-L.YangLee, Y.-H.Y.-H.LeeChang, C.-J.C.-J.ChangLu, A.-J.A.-J.LuHsu, W.-C.W.-C.HsuWang, L.L.WangLeung, M.-K.M.-K.LeungDai, C.-A.C.-A.Dai2020-06-232020-06-2320100887624Xhttps://scholars.lib.ntu.edu.tw/handle/123456789/504247Through the Stille coupling polymerization, a series of soluble acceptor/donor quinoxaline/thiophene alternating conducting polymers with a hole-transporting moiety of carbazole as a side chain (PCPQT) has been designed, synthesized, and investigated. The UV-vis measurement of the chargetransferred type PCPQTs of different molecular weights with low polydispersity exhibits a red shifting of their absorption maximum from 530 to 630 nm with increasing chain length (Mn: from 1100 to 19,200). The HOMO and LUMO energy levels of PCPQT can be determined from the cyclic voltammetry measurement to be -5.36 and -3.59 eV, respectively. Solar cells made from PCPQT/PCBM bulk heterojunction show a high open-circuit voltage, Voc of ∼0.75 V, which is significantly higher than that of a solar cell made from conventional poly(3- hexyl thiophene)/PCBM as the active polymer PCPQT has lower HOMO level. Further improvements are anticipated through a rational design of the new low band-gap and the structurally two-dimensional donor-acceptor conducting polymers. © 2010 Wiley Periodicals, Inc.[SDGs]SDG7Absorption maxima; Active polymers; Band gaps; Bulk heterojunction; Donor-acceptors; Fractionation of polymers; Hole transporting; LUMO energy levels; Rational design; Redshifting; Side chains; Stille coupling; Structure property relation; UV-vis spectroscopy; Chromophores; Conducting polymers; Electrochemistry; Heterojunctions; Open circuit voltage; Organic conductors; Photovoltaic cells; Polydispersity; Solar cells; Thiophene; Ultraviolet spectroscopy; Cyclic voltammetry; Manganese; Manganese compounds; Cyclic voltammetry; Conducting polymersjournal article10.1002/pola.23921