期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 7, 期 6, 页码 1966-1973出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ee00022f
关键词
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资金
- National Program on Key Basic Research Project (973 Program) [2011CB932304, 2014CB643502, 2014CB643501, 2014CB643600]
- NSFC [51103164, 21374124]
- Ministry of Science and Technology of China
- Chinese Academy of Sciences
With the power conversion efficiency of polymer solar cells (PSCs) approaching the milestone value of 10%, their instability associated with a low work function metal cathode, particularly in the presence of oxygen and moisture, becomes a critical issue for real applications. To alleviate the air-sensitive problem, two easy-accessible solution-processed, environmentally friendly organic small-molecule cathode interlayers, with perylene diimides (PDI) as the core and amino (PDIN) or amino N-oxide (PDINO) as the terminal substituent, are explored. Benefitting from the extended planar structure of the PDI units, the two interlayer materials show high conductivities of similar to 10(-5) S cm(-1). This is the first time that thickness-insensitive small-molecule-based cathode interlayers are reported. It is also found that the work function tuning effect of the two PDI-based interlayers allows high work function metals (such as Au and Ag) to act as the cathode. With the conventional device structure with PTB7 as a donor and PC70BM as an acceptor, the PDINO-based devices exhibit an efficiency of 8.24% with Al as the top electrode and 8.16% with Ag as the top electrode, much higher than that of the corresponding Ca/Al-based device (6.98%). The high efficiency of 8.35% is also achieved in the device with PTB7-Th as the donor. The success of the two PDI-interlayers indicates that pi-delocalized planar structures with high electron affinities could be particularly useful in developing high-performance organic interlayer materials.
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