title: Hydrophilic Conjugated Polymers with Large Bandgaps and Deep-Lying HOMO Levels as an Efficient Cathode Interlayer in Inverted Polymer Solar Cells.
abstract: Two hydrophilic conjugated polymers, PmP-NOH and PmP36F-NOH, with polar diethanol-amine on the side chains and main chain structures of poly(meta-phenylene) and poly(meta-phenylene-alt-3,6-fluorene), respectively, are successfully synthesized. The films of PmP-NOH and PmP36F-NOH show absorption edges at 340 and 343 nm, respectively. The calculated optical bandgaps of the two polymers are 3.65 and 3.62 eV, respectively, the largest ones so far reported for hydrophilic conjugated polymers. PmP-NOH and PmP36F-NOH also possess deep-lying highest occupied molecular orbital levels of -6.19 and -6.15 eV, respectively. Inserting PmP-NOH and PmP36F-NOH as a cathode interlayer in inverted polymer solar cells with a PTB7/PC71 BM blend as the active layer, high power conversion efficiencies of 8.58% and 8.33%, respectively, are achieved, demonstrating that the two hydrophilic polymers are excellent interlayers for efficient inverted polymer solar cells.
authors.affiliation: Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Kan
authors.affiliation: Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Yongxiang
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Zhulin
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Lianjie
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Junwu
authors.initials: J
authors.lastname: Chen
authors.affiliation: Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials & Devices, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Cao
mesh_terms: D004566:Electrodes; D057927:Hydrophobic and Hydrophilic Interactions; D011108:Polymers / Q000737:chemistry*; D012993:Solar Energy
chemical_list: D011108:Polymers
keywords: 3,6-fluorene; hydrophilic polymers; interfaces; inverted polymer solar cells; meta-phenylene