期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 3, 期 11, 页码 2664-2676出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tc02251c
关键词
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资金
- U.S. Department of Energy [DE-FG36-08GO18018]
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0010419]
- UC Davis
- Okinawa Institute of Science and Technology Graduate University (OIST)
- InnoPro. le Project of the German Ministry of Education and Research (BMBF) [03IP602]
Poly(3,4-ethylenedioxythiophene)-poly(styrenesulphonate) (PEDOT:PSS) is the most used organic hole injecting or hole transporting material. The hole carrying matrix PEDOT is highly doped by the acidic dopant PSS. When coated onto a substrate, PEDOT: PSS makes a highly uniform conductive layer and a thin (<5 nm) overlayer of PSS covers the air interface. Semiconducting polymer layers for organic photovoltaics or light emitting diodes are coated on top. In this article, we demonstrate that the PSS layer will mix with almost all conjugated polymers upon thermal annealing. Depending on the Fermi energy of the polymer an electrochemical reaction can take place, p-type doping the polymer at the interface between the PEDOT: PSS and the semiconducting polymer. We use chemical and spectroscopic analysis to characterize the polymer/PSS interlayer. We show that the stable and insoluble interlayer has a great effect on the charge injection and extraction from the interface. Finally we demonstrate and electronically model organic photovoltaic devices that are fabricated using these mixed interlayers.
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