title: Excellent Long-Term Stability of Power Conversion Efficiency in Non-Fullerene-Based Polymer Solar Cells Bearing Tricyanovinylene-Functionalized n-Type Small Molecules.
abstract: New small molecules having modified acceptor strength and π-conjugation length and containing dicyanovinylene (DCV) and tricyanovinylene (TCV) as a strongly electron-accepting unit with indacenodithiophene, IDT(DCV)2, IDT(TCV)2, and IDTT(TCV)2, were synthesized and studied in terms of their applicability to polymer solar cells with PTB7-Th as an electron-donating polymer. Intriguingly, the blended films containing IDT(TCV)2and IDTT(TCV)2exhibited superior shelf life stabilities of more than 1000 h without any reduction in the initial power conversion efficiency. The low-lying lowest unoccupied molecular orbital energy levels and robust internal morphologies of small TCV-containing molecules could afford excellent shelf life stability.
authors.affiliation: Department of Chemistry, Research Institute for Natural Sciences, Korea University , 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea.
authors.forename: Eun Yi
authors.initials: EY
authors.lastname: Ko
authors.affiliation: Department of Chemistry, Research Institute for Natural Sciences, Korea University , 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea.
authors.forename: Gi Eun
authors.initials: GE
authors.lastname: Park
authors.affiliation: Department of Chemistry, Research Institute for Natural Sciences, Korea University , 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea.
authors.forename: Ji Hyung
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Department of Chemistry, Research Institute for Natural Sciences, Korea University , 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea.
authors.forename: Hyung Jong
authors.initials: HJ
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Research Institute for Natural Sciences, Korea University , 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea.
authors.forename: Dae Hee
authors.initials: DH
authors.lastname: Lee
authors.affiliation: Department of Life Science & Chemical Materials, Pohang Accelerator Laboratory, POSTECH , 80 Jigok-ro, Nam-gu Pohang 790-834, Korea.
authors.forename: Hyungju
authors.initials: H
authors.lastname: Ahn
authors.affiliation: Department of Nanofusion Engineering, Departement of Cogno-Mechatronics Engineering, Pusan National University , Miryang 627-706, Korea.
authors.forename: Mohammad Afsar
authors.initials: MA
authors.lastname: Uddin
authors.affiliation: Department of Chemistry, Research Institute for Natural Sciences, Korea University , 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea.
authors.forename: Han Young
authors.initials: HY
authors.lastname: Woo
authors.affiliation: Department of Chemistry, Research Institute for Natural Sciences, Korea University , 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea.
authors.forename: Min Ju
authors.initials: MJ
authors.lastname: Cho
authors.affiliation: Department of Chemistry, Research Institute for Natural Sciences, Korea University , 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Korea.
authors.forename: Dong Hoon
authors.identifier: http://orcid.org/0000-0002-3165-0597
authors.initials: DH
authors.lastname: Choi
keywords: bulk heterojunction organic solar cell; n-type small molecules; non-fullerene solar cell; stability; tricyanovinylene