Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 17, Pages 14986-14992Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b01147
Keywords
electron-transport layer (ETL); small-molecule zwitterion; nonfullerene polymer solar cells; thickness insensitivity; high WF metals
Funding
- Zhejiang Provincial Natural Science Foundation of China [LY18E030012]
- National Natural Science Foundation of China [51603213, 51773213, 61474125]
- Key Research Program of Frontier Sciences [QYZDB-SSW-JSC047]
- Zhejiang Province Science and Technology Plan [2018C01047]
- Ningbo Natural Science Foundation of China [2017A610016, 2017A610017, 2017A610014]
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Nonfullerene polymer solar cells (PSCs) have earned widespread and intense interest on account of their properties such as tunable energy levels, potential for low-cost production processes, reduced energy losses, and strong light absorption coefficients. Here, a water-/alcohol-soluble zwitterion perylene diimide zwitterion (PDI-z) consisted of sulfobetaine ion as a terminal substituent and PDI as a conjugated core was synthesized. PDI-z was employed as an electron-transport layer (ETL) for nonfullerene PSC devices, obtaining an optimal power conversion efficiency (PCE) above 11.23%. Moreover, nonfullerene PSCs with the PDI-z cathode interlayer displayed an excellent performance on a large scale of interlayer thickness, which was compatible with printing fabrication techniques. Additionally, the PDI-z interlayer presented good ability of modifying high work function metals (for instance, Au, Cu, and Ag) in nonfullerene devices, and the Ag device displayed a PCE of 9.38%. This work provides a good alternative ETL for high-efficiency nonfullerene PSCs.
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