10.1021/jacs.8b01783.s001 Rui Shang Rui Shang Zhongmin Zhou Zhongmin Zhou Hiroki Nishioka Hiroki Nishioka Henry Halim Henry Halim Shunsuke Furukawa Shunsuke Furukawa Izuru Takei Izuru Takei Naoya Ninomiya Naoya Ninomiya Eiichi Nakamura Eiichi Nakamura Disodium Benzodipyrrole Sulfonate as Neutral Hole-Transporting Materials for Perovskite Solar Cells American Chemical Society 2018 Perovskite Solar Cells Hole-transporting material device Disodium Benzodipyrrole Sulfonate racemic alkanediylsulfonate anion side chains MAPbI 3 Neutral Hole-Transporting Materials HTM BDPSO 2018-04-06 17:05:21 Journal contribution https://acs.figshare.com/articles/journal_contribution/Disodium_Benzodipyrrole_Sulfonate_as_Neutral_Hole-Transporting_Materials_for_Perovskite_Solar_Cells/6107006 Hole-transporting material (HTM) is an indispensable constituent in organic electronic devices, generally comprising a donor/dopant combination. We report that a disodium salt of substituted benzo­[1,2-<i>b</i>:4,5-<i>b</i>′]­dipyrrole bearing two racemic alkanediylsulfonate anion side chains (BDPSOs) serves as a neutral, nonhygroscopic, dopant-free HTM for lead perovskite (MAPbI<sub>3</sub>) solar cells. These organic/inorganic hybrid molecules are useful for tunable orbital level and controllable solubility. A fluorinated BDPSO has an energy level matched with MAPbI<sub>3</sub>, affording an inverted-structure solar cell that performs with 17.2% efficiency with minimal hysteresis. The solar cell devices fabricated using BDPSOs showed remarkable storage and operational stability.