A water/alcohol-soluble conjugated porphyrin small molecule as a cathode interfacial layer for efficient organic photovoltaics. Issue 39 (20th September 2016)

• Record Type: Journal Article
• Authors: Zhang, Lin; Liu, Chang; Lai, Tianqi; Huang, Huadong; Peng, Xiaobin; Huang, Fei; Cao, Yong
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 39(2016)
• Page Start: 15156
• Page End: 15161
• Publication Date: 2016-09-20
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta05726h
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A water/alcohol-soluble conjugated porphyrin small molecule exhibits very good ability as a cathode interfacial material in organic solar cells. Abstract : A water/alcohol soluble conjugated porphyrin small molecule, FNEZnP-OE, in which two amino-functionalized fluorenes (9, 9-bis(30-( N, N -dimethylamino)propyl)-2, 7-fluorenes) are linked to a porphyrin core substituted with two polar 3, 4-bis-[2-(2-methoxy-ethoxy)-ethoxy]-phenyls by ethynylene linkages, is designed and synthesized as a cathode interfacial material (CIM) for bulk heterojunction organic solar cells. ThePTB7/PC71 BM - andPTB7-Th/PC71 BM -based devices withFNEZnP-OE as the electron transport layers (ETLs) exhibit power conversion efficiencies (PCEs) of 8.52% and 9.16%, respectively, which are increased by 47% and 41% compared to the devices with no ETL (5.78% and 6.50%, respectively). Most significantly, these PCEs are increased by 13.6% and 8%, respectively, over those with the widely used polymer ETL PFN (poly[(9, 9-bis(30-( N, N -dimethylamino)propyl)-2, 7-fluorene)- alt -2, 7-(9, 9-ioctylfluorene)]). The outstanding performance ofFNEZnP-OE CIM is contributed by not only the polar groups of 9, 9-bis(30-( N, N -dimethylamino)propyl)-2, 7-fluorenes and 3, 4-bis-[2-(2-methoxy-ethoxy)-ethoxy]-phenyls but also the porphyrin-relating π-conjugated backbone ofFNEZnP-OE induced by the ethynylene linkages, demonstrating that functionalized porphyrins are very promising interfacial materials.