Two-dimensional photovoltaic copolymers with spatial D-A-D structures: synthesis, characterization and hetero-atom effect

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• 作者：Ying Li (1)
  Xiaopeng Xu (1)
  Zuojia Li (1)
  Ting Yu (1)
  Qiang Peng (1)
  
  1. Key Laboratory of Green Chemistry and Technology of Ministry of Education ; College of Chemistry ; Sichuan University ; Chengdu ; 610064 ; China
  
• 关键词：two ; dimensional polymers ; bulk heterojunction solar cells ; hetero ; atom effect ; low band gap ; carrier mobility
• 刊名：SCIENCE CHINA Chemistry
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：58
• 期：2
• 页码：276-285
• 全文大小：1,259 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Chinese Library of Science
  Chemistry
  
• 出版者：Science China Press, co-published with Springer
• ISSN：1869-1870

文摘

A series of two-dimensional (2D) conjugated copolymers with spatial D-A-D structures (PTNBTB, PTCBTB, and PTSBTB) consisting of hetero-atom-bridged dithiophene and phenylvinyl-substituted benzothiadiazole blocks in the main chain have been designed, synthesized, and characterized. The structure-property relationships of the resulting copolymers were systematically investigated. The effects of the bridging atoms (N, C, and Si) on their thermal, optical, electrochemical and charge-transporting properties were also studied. PTNBTB exhibits a smaller band gap with red-shifted absorption, whereas PTSBTB possesses deeper HOMO level and higher hole mobility than PTCBTB or PTSBTB. Bulk heterojunction (BHJ) solar cells were fabricated and characterized with the conventional configuration of ITO/PEDOT:PSS/copolymer:PC71BM (1:1)/Ca/Al. As expected, PTSBTB devices showed the highest PCE, up to 4.01%, which was due to the lower HOMO level, higher carrier mobility, and stronger optical response as well as the finer nanoscale phase separation of the pristine polymer and/or the corresponding blending active layer with PC71BM. The primary results offer useful insights in designing 2D copolymers with spatial D-A-D backbone and different hetero-atom bridged donor units to finely tune the absorptions, electronic energy levels, carrier mobilities and the photovoltaic properties.