Brief description of the progress made in flexible organic solar cells in Ningbo Materials

Organic solar cells have the advantages of light, flexibility, low cost, and weak light response. They are the hot research direction of the current solar cell technology. High-efficiency, bending resistant and cheap flexible organic solar cells have strong application potential in flexible wearable and portable electronic equipment, photovoltaic building integration and military. At present, most of the research results of organic solar cells are based on rigid tin oxide(ITO) glass substrates. However, if organic solar cells are to be commercialized, their real advantage is that they are manufactured using low-cost wet printing and roll to roll technology. In organic solar cells, the most commonly used electrode material is indium-doped tin oxide(ITO). However, ITO has problems such as poor conductivity and mechanical brittleness on plastic substrates, and ITO is usually processed by vacuum sputtering at high temperatures, which makes it expensive and is not conducive to the use of large area printing and scrolling. To prepare. There have been some reports of the use of new electrode materials instead of traditional ITOs, such as nano silver lines, graphene, carbon nanotubes, conductive polymers, etc., in which(3, 4-Ethylenedioxythiophene): Polyethylene(phenylvinyl sulfonic acid)(PEDOT: PSS) thin films are relatively inexpensive, and the thin films exhibit high optical and electrical properties, excellent thermal stability, and good flexibility. Wait. The use of acid doping PEDOT: PSS can greatly increase its conductivity, but most of the current reports use strong acids such as sulfuric acid, nitric acid, etc. for doping, followed by high-temperature post-treatment, easy to damage PET and other flexible plastic substrate.

Recently, Geziyi, a researcher at the Ningbo Institute of Materials Technology and Engineering of the Chinese Academy of Sciences, based on the previous high-efficiency organic solar cell research(NaturePhonics, 2015, 9,520; AdvancedMaterials, 2018, 30, 1703005; Macromolecules, 2018, DOI: 10.1021 / acs.macromol .8b00683; JournalofMateriales ChemistryA, 2018, 6,464), made new progress in the field of flexible organic solar cells, innovating the development of low-temperature acid treatment PEDOT: PS electrode replacement requires high-temperature sputtering and expensive ITO electrodes. The PEDOT: PSS thin film is improved by low temperature sulfonic acid treatment, and the roughness of the thin film is reduced. At the same time, the destruction of flexible plastic substrate by traditional strong acid treatment is avoided. Then, using full-solution processing technology, PBDB-T and IT-M non-fullerene active layers were used to prepare non-ITO single-knot flexible organic solar cells by wet method, and the energy conversion efficiency of batteries reached 10.12 %. This is the highest efficiency of flexible organic solar cells processed by all wet methods reported so far. Moreover, this kind of flexible organic solar cells processed in full solution meet the technical requirements of large area preparation processes such as scrolling printing and scraping, and provide an important reference route for the low cost and flexibility of organic solar cells. The work was published in the International Journal Advanced Materials under the title AllSolence-ProcessedMetalOxide-Free FlexleOrganic SolarCellswith OverOver10 % Advanced Materials. Gezi, a member of the Fanxi team, is the co-author of the paper, and Songwei, a master student, is the first author.

The above research has received national key R&D programs(2017 YFE0106000 and 2016 YFB 0401000) and National Natural Science Foundation(51773212, 21574144 and 21674123), Advanced Science Key Research Project of the Chinese Academy of Sciences(QYZDB-SSW-SYS030), Key International Cooperation Project of the Chinese Academy of Sciences(174433KYSB2016 0065), Cross-innovation Team of the Chinese Academy of Sciences, Outstanding Youth Fund of Zhejiang Province(LR16B 04002) and Ningbo City Science and Technology Innovation Team(2015B11002, 0210002) 2016 B10005) and other funding.

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