Realizing over 10% efficiency in polymer solar cell by device optimization

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• 作者：Shaoqing Zhang (1) (2)
  Long Ye (1)
  Wenchao Zhao (1)
  Bei Yang (1)
  Qi Wang (1) (2)
  Jianhui Hou (1) (2)
  
  1. State Key Laboratory of Polymer Physics and Chemistry ; Beijing National Laboratory for Molecular Sciences ; Institute of Chemistry ; Chinese Academy of Sciences ; Beijing ; 100190 ; China
  2. School of Chemistry and Biology Engineering ; University of Science and Technology Beijing ; Beijing ; 100083 ; China
  
• 关键词：polymer solar cells ; photovoltaic polymer ; device optimization ; solvent additives
• 刊名：SCIENCE CHINA Chemistry
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：58
• 期：2
• 页码：248-256
• 全文大小：1,594 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

The low band gap polymer based on benzodithiophene (BDT)-thieno[3,4-b]thiophene (TT) backbone, PBDT-TS1, was synthesized following our previous work and the bulk heterojunction (BHJ) material comprising PBDT-TS1/PC71BM was optimized and characterized. By processing the active layer with different additives i.e. 1,8-diiodooctane (DIO), 1-chloronaphthalene (CN) and 1, 8-octanedithiol (ODT) and optimizing the ratio of each additive in the host solvent, a high PCE of 9.98% was obtained under the condition of utilizing 3% DIO as processing additive in CB. The effect of varied additives on photovoltaic performance was illustrated with atomic force microscopy (AFM) and transmission electron microscope (TEM) measurements that explained changes in photovoltaic parameters. These results provide valuable information of solvent additive choice in device optimization of PBDTTT polymers, and the systematic device optimization could be applied in other efficient photovoltaic polymers. Apparently, this work presents a great advance in single junction PSCs, especially in PSCs with conventional architecture.