Lo, Y.-C.Y.-C.LoTing, H.-C.H.-C.TingLi, Y.-Z.Y.-Z.LiLi, Y.-H.Y.-H.LiLiu, S.-W.S.-W.LiuHuang, K.-W.K.-W.HuangWong, K.-T.K.-T.Wong2019-07-312019-07-312017https://www.scopus.com/inward/record.uri?eid=2-s2.0-85021795029&doi=10.1039%2fc6qo00673f&partnerID=40&md5=76357cbe856d8eb1ee02e57734e4dfa7https://scholars.lib.ntu.edu.tw/handle/123456789/415842The synthesis, structure, and properties of three new 5,6,11,12-tetraarylindeno[1,2-b]fluorenes are reported. The highly twisted conformations between an indeno[1,2-b]fluorene core and peripheral aryl substitutions endow these indeno[1,2-b]fluorene derivatives with good photostability for use as electron donors for vacuum-deposited photovoltaic devices. The optimized device based on a TAInF2 donor blended with C70 as an electron acceptor produces a high open-circuit voltage (>0.9 V) and a power conversion efficiency of 2.91%. This work demonstrates the first application of an indenofluorene derivative as an electron donor in organic solar cells. © 2017 the Partner Organisations.[SDGs]SDG7Open circuit voltage; Organic solar cells; Aryl substitution; Electron acceptor; Indeno[1 ,2-b]fluorene; Optimized devices; Organic photovoltaic devices; Photovoltaic devices; Power conversion efficiencies; Twisted conformation; Solar cellsjournal article10.1039/c6qo00673f2-s2.0-85021795029