材料与化学化工学部学术报告:Understanding the importance of bulk-heterojunction microstructure stability in solution-processed organic solar cells

报告题目:Understanding the importance of bulk-heterojunction microstructure stability in solution-processed organic solar cells

报告人:李宁

报告时间:20170105日(星期五) 下午14:00

报告地点:9071445

 

报告人简介:

 

李宁,男,19865月出生,同济大学材料科学与工程专业本科,德国埃尔朗根纽伦堡大学(FAU)材料科学与工程专业硕士/博士,现在德国FAU Brabec教授团队从事研究工作,任课题组长及科研项目负责人。长期从事新型可印刷有机光电功能材料及器件的表征与研究,重点研究新一代光电功能器件的新型结构以及产业化进展。近五年在国际权威期刊共发表学术论文50余篇,他引2200余次,其中Science 1 篇,Nat. Energy 1篇,Nat. Commun. 2篇,Energy & Environ. Sci. 10篇,Adv. Energy Mater. 14篇,有4篇入选ESI高被引论文。主持德国研究基金会-中国国家自然科学基金委中德国际合作项目1项,FAU-亥姆霍兹联合会埃尔朗根纽伦堡研究所联合研究项目2项,获2013年国家优秀自费留学生奖学金,2015FAU优秀博士毕业生奖,2017IUMRS-ICAM国际会议青年科学家奖铜奖,2017FAU新兴人才计划资助

 

报告摘要:

The performance of organic solar cells (OSCs) is governed by the delicate, optimized bulk-heterojunction (BHJ) microstructure, where organic donor and acceptor are fine-mixed in the nanometer regime to facilitate exciton dissociation. For the same material composition, the quantum efficiencies may vary from close to 100 % to even less than 10 % as a function of processing. To push organic photovoltaics towards commercial applications, a module efficiency of >10% in combination with an operational lifetime of >10 years is required. Therefore, the morphology evolution as well as the stability of BHJ microstructure has to be well investigated and analyzed.

    In this presentation, I will examine the reliability and stability of BHJ microstructures for various solution-processed OSCs and explore their potential for large-scale mass production. We recently found that selected high performance systems gain their high excellent performance from a meta-stable microstructure, which quickly relaxed to the thermodynamic equilibrium state under external stress, such as light or thermal stress. The so called burn-in degradation is identified as a spinodal de-mixing due to the low miscibility of donor and acceptor, which is turned out to be a major challenge for the development of stable and efficient OSCs. Even though the BHJ microstructure can be kinetically tuned for achieving high-performance, the inherently low miscibility of donor and acceptor leads to spontaneous phase separation even in the solid state.

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