Journal
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
Volume 15, Issue 3, Pages 571-578Publisher
SPRINGER
DOI: 10.1007/s11705-020-2010-1
Keywords
organic solar cell; block copolymer; cathode interlayer
Categories
Funding
- National Natural Science Foundation of China [21801238, 61504015]
- National Youth Thousand Program Project [R52A199Z11]
- CAS Pioneer Hundred Talents Program B [Y92A010Q10]
- National Special Funds for Repairing and Purchasing Scientific Institutions [Y72Z090Q10]
- Natural Science Foundation of Chongqing [cstc2017jcyjA0752, cstc2018jcy-jAX0556, cstc2017jcy-jAX0384, cstc2018jszx-cyzdX0137]
- artificial intelligence key project of Chongqing [cstc2017rgzn-zdyfX0030]
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems [LLEUTS-2017004, LLEUTS-2019001]
- Venture & Innovation Support Program for Chongqing Overseas Returnees [cx2017034, cx2019028]
- Chongqing Talents Top Youth Talent Program [CQYC201905057]
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This study introduces block copolymers with well-controlled chemical composition and molecular weight for cathode interlayer applications in organic solar cells, showing higher power conversion efficiency and better stability compared to the widely-applied ZnO counterparts. The block copolymer thin film has abundant conductive channels and excellent longitudinal electron conductivity, forming interpenetrating networks for improved performance. No post-treatment is needed for the block copolymer based cathode interlayer, ensuring excellent processability.
Emerging needs for the large-scale industrialization of organic solar cells require high performance cathode interlayers to facilitate the charge extraction from organic semiconductors. In addition to improving the efficiency, stability and processability issues are major challenges. Herein, we design block copolymers with well controlled chemical composition and molecular weight for cathode interlayer applications. The block copolymer coated cathodes display high optical transmittance and low work function. Conductivity studies reveal that the block copolymer thin film has abundant conductive channels and excellent longitudinal electron conductivity due to the interpenetrating networks formed by the polymer blocks. Applications of the cathode interlayers in organic solar cells provide higher power conversion efficiency and better stability compared to the most widely-applied ZnO counterparts. Furthermore, no post-treatment is needed which enables excellent processability of the block copolymer based cathode interlayer.
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