title: High open circuit voltage organic photovoltaic cells fabricated using 9,9'-bifluorenylidene as a non-fullerene type electron acceptor.
abstract: We have found that 9,9'BF can be used as an electron acceptor for P3HT-based OPVs while similar devices using 4,4'BP do not show any photovoltaic effect. This can be related to the respective aromaticity and antiaromaticity of the reduced forms of 9,9'BF or 4,4'BP. The OPV device fabricated using P3HT and 9,9'BF exhibited a PCE of 2.28% with a V(oc) of 1.07 V, a J(sc) of 5.04 mA cm(-2), and a FF of 0.42.
authors.affiliation: Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 609-735, Republic of Korea. dohoonhwang@pusan.ac.kr.
authors.forename: Hee Un
authors.initials: HU
authors.lastname: Kim
authors.forename: Ji-Hoon
authors.initials: JH
authors.lastname: Kim
authors.forename: Hongsuk
authors.initials: H
authors.lastname: Suh
authors.forename: Jeonghun
authors.initials: J
authors.lastname: Kwak
authors.forename: Dongwook
authors.initials: D
authors.lastname: Kim
authors.forename: Andrew C
authors.initials: AC
authors.lastname: Grimsdale
authors.forename: Sung Cheol
authors.initials: SC
authors.lastname: Yoon
authors.forename: Do-Hoon
authors.initials: DH
authors.lastname: Hwang