Alcohol-soluble polyfluorenes containing dibenzothiophene-S,S-dioxide segments for cathode interfacial layer in PLEDs and PSCs |
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| Affiliation: | 1. Department of Materials and Engineering, Nanchang Hangkong University, Nanchang 330063, China;2. State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China;3. Department of Information Engineering, Nanchang Hangkong University, Nanchang 330063, China;1. ISA Institut des Sciences Analytiques, Université Claude Bernard Lyon 1, 5 rue de la Doua, 69100 Villeurbanne, France;2. IRCELYON Institut de recherches sur la catalyse et l’environnement de Lyon, Université Claude Bernard Lyon1, 2 avenue Albert Einstein, 69626 Villeurbanne, France;1. State Key Laboratory of Heavy Oil Processing and College of Chemical Engineering, China University of Petroleum, Beijing 102249, PR China;2. Beijing SJ Environmental Protection and New Material Co. Ltd, Beijing 100080, PR China;1. The Institute for the Liberal Arts, Doshisha University, Karasuma-Higashi-iru, Imadegawa-dori, Kamigyo-ku, Kyoto 602-8580, Japan;2. Graduate School of Economics, Kobe University, 2-1 Rokkodai, Nada, Kobe 657-8501, Japan;1. Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, CEP 97105-900, RS, Brazil;2. Laboratório de Síntese, Reatividade e Avaliação Farmacológica e Toxicológica de Organocalcogênios, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, CEP 97105-900, RS, Brazil;1. Department of Mathematics and Physics, North China Electric Power University, Beijing 102206, China;2. College of Mathematics, Physics and Information Engineering, Jiaxing University, Zhejiang 314001, China;3. Institute of Applied Physics and Computational Mathematics, P. O. Box 8009, Beijing 100088, China |
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| Abstract: | A series of alcohol-soluble amino-functionalized polyfluorene derivatives (PF-N-S, PF-N-SC8 and PF-N-SOC8) comprising various ratios of dibenzothiophene-S,S-dioxide segments (S/SC8/SOC8) in the main chains, respectively, were synthesized and utilized as cathode interfacial layer (CIL) in polymer light-emitting diodes (PLEDs) and polymer solar cells (PSCs) with high-work-function Al (or Au) electrode. The polymers possess LUMO/HOMO levels at ?2.78 to ?3.53 eV/?5.69 to ?6.32 eV. Multilayer PLEDs and PSCs with device configurations of ITO/PEDOT:PSS (40 nm)/P-PPV or PFO-DBT35:PCBM = 1:2 (80 nm)/CIL (3–15 nm)/Al (or Au) (100 nm) were fabricated. The PF-N-S-10/Al (or Au) cathode PLEDs displayed maximum luminous efficiency of 24.4 cd A?1 (or 11.9 cd A?1), significantly higher than bare Al (or Au) cathode device, exceeding well-known Ba/Al and poly(9,9-bis(3′-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] (PFN)/Al (or PFN/Au) cathode devices. The enhanced open-circuit voltages (Vocs), electron reflux and reduced work functions clarify that the electron injection barrier from the Al (or Au) electrode can be lowered by inserting the polymers as CIL. The resulted PSCs also show device performances exceeding Al and PFN/Al cathode devices. The results indicate that PF-N-S, PF-N-SC8 and PF-N-SOC8 are excellent CIL materials for PLEDs and PSCs with high-work-function Al or Au electrode. |
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| Keywords: | Amino-functionalized polyfluorene derivatives Dibenzothiophene-S S-dioxide Cathode interfacial layer Polymer light-emitting diode Polymer solar cell |
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