Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 17, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202111706
Keywords
interlayer; nonfullerene; organic solar cells; phenol functionalized perylene bisimide; stability
Categories
Funding
- National Natural Science Foundation of China (NSFC) [21733005, 21975076]
- NSFC
- German Research Foundation (DFG) [51761135101, Wu317/21-1]
- Bavarian State Ministry of Science, Research, and the Arts
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A new electron transporting layer composed of PBI-2P is successfully applied to nonfullerene organic solar cells, resulting in improved device stability and efficiency.
A new type of cathode interlayer composed of 2,6-di-tert-butyl-phenol-functionalized perylene bisimide (PBI-2P) is successfully applied as an electron transporting layer for fused-ring nonfullerene organic solar cells (OSCs). The stable contact between these novel electron transporting layers and the representative nonfullerene acceptor Y6 greatly enhances the device stability compared to conventional amine-group containing cathode interlayers. Moreover, the easily formed biradical species in the interlayers yields rather good thickness tolerance of the PBI-2P layer in photovoltaic devices. The OSCs based on the PBI-2P interlayer show a power conversion efficiency up to 17.20% and good stability compared to amino-group functionalized interlayers. The findings demonstrate a promising design principle for cathode interlayer engineering based on pigment chromophores equipped with the 2,6-di-tert-butylphenoxy groups that are prone to form the respective ultrastable butylphenoxy radicals for stable nonfullerene OSCs.
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