Lai K.-WChang C.-CChu C.W.CHIEN-CHENG CHANG2021-08-052021-08-05202115661199https://www.scopus.com/inward/record.uri?eid=2-s2.0-85097912051&doi=10.1016%2fj.orgel.2020.106010&partnerID=40&md5=cae8b473944bd5b27c7ef26d7df50ffdhttps://scholars.lib.ntu.edu.tw/handle/123456789/577056In this study we prepared four benzodithiophene (BDT)-based small organic molecules presenting bithiophene (TT), thiophene (FT), carbazole (CB), and triphenylamine (TPA) units, respectively, as termini, and used them as hole transporting materials for perovskite solar cells (PSCs). The high degrees of planarity of these BDT-based small molecules imparted them with high degrees of stacking and charge transport. These small molecules had suitable optical properties and energy level alignments for use in PSCs based on MAPbI3, with compact-TiO2 as the electron transporting layer and a BDT-based material as the hole transporting layer, in a n–i–p structure. Among our tested BDT-based materials, the PSC incorporating BDT-TT had the best performance, with an average power conversion efficiency of 13.63%. ? 2020Conversion efficiency; Lead compounds; Molecules; Optical properties; Perovskite; Titanium dioxide; Benzodithiophene; Electron transporting layer; Energy level alignment; Hole transporting layers; Hole-transporting materials; Small molecules; Small organic molecules; Triphenylamines; Perovskite solar cells[SDGs]SDG7journal article10.1016/j.orgel.2020.1060102-s2.0-85097912051