Oh, Seung-Hwan Na, Seok-In Jo, Jang Lim, Bogyu Vak, Doojin Kim, Dong-Yu 2024-01-20T19:02:40Z 2024-01-20T19:02:40Z 2021-09-02 2010-06-23 1616-301X https://pubs.kist.re.kr/handle/201004/131320 Novel poly[(9,9-bis((6'-(N,N,N-trimethylammonium)hexyl)-2,7-fluorene)-alt-(9,9-bis(2-(2-(2-methoxyethoxy)ethoxy)ethyl)-9-fluorene)) dibromide (WPF-6-oxy-F) and poly[(9,9-bis((6'-(N,N,N-trimethylammonium)hexyl)-2,7-fluorene)-alt-(9,9-bis(2-(2-methoxyethomethyl)-fluorene)] dibromide (WPF-oxy-F) compounds are developed and the use of these water-soluble polymers as an interfacial layer for low-cost poly(3-hexylthiophene):phenyl-C-61 butyric acid methyl ester (P3HT:PCBM) organic solar cells (OSCs) is investigated. When WPF-oxy-F or WPF-6-oxy-F is simply inserted between the active layer and the cathode as an interfacial dipole layer by spin-coating water-soluble polyfluorenes, the open-circuit voltage (V-oc), fill factor (FF), and power-conversion efficiency (PCE) of photovoltaic cells with high work-function metal cathodes, such as Al, Ag, Au, and Cu, dramatically increases. For example, when WPF-6-oxy-F is used with Al, Ag, Au, or Cu, regardless of the work-function of the metal cathode, the Voc is 0.64, 0.64, 0.58, and 0.63 V, respectively, approaching the original value of the P3HT:PCBM system because of the formation of large interfacial dipoles through a reduction of the metal work-function. In particular, introducing WPF-6-oxy-F into a low-cost Cu cathode dramatically enhanced the device efficiency from 0.8% to 3.36%. English WILEY-V C H VERLAG GMBH ENERGY-LEVEL ALIGNMENT OPEN-CIRCUIT VOLTAGE PHOTOVOLTAIC PERFORMANCE FULLERENE DERIVATIVES POLYMER ELECTRODES METAL BAND Water-Soluble Polyfluorenes as an Interfacial Layer Leading to Cathode-Independent High Performance of Organic Solar Cells Article 10.1002/adfm.200902386 1 ADVANCED FUNCTIONAL MATERIALS, v.20, no.12, pp.1977 - 1983 ADVANCED FUNCTIONAL MATERIALS 20 12 1977 1983 scie scopus 000279707200014 2-s2.0-77953823601 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article ENERGY-LEVEL ALIGNMENT OPEN-CIRCUIT VOLTAGE PHOTOVOLTAIC PERFORMANCE FULLERENE DERIVATIVES POLYMER ELECTRODES METAL BAND