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Dedoping induced interfacial instability of poly(ethylene imine)s treated PEDOT:PSS as low-work-function electrodes

Transparent organic electrodes printed from high-conductivity PEDOT: PSS have become essential for upscaling all-carbon based, low-cost optoelectronic devices. In the printing process, low-work-function PEDOT: PSS electrodes (cathode) are achieved by coating an ultra-thin, non-conjugated polyelectro...

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Main Authors: Cai, Wanzhu (Author) , Österberg, Thomas (Author) , Jafari, Mohammad Javad (Author) , Musumeci, Chiara (Author) , Wang, Chuanfei (Author) , Zuo, Guangzheng (Author) , Yi, Xiaolong (Author) , Luo, Xuhao (Author) , Johansson, Jim (Author) , Kemerink, Martijn (Author) , Ouyang, Liangqi (Author) , Ederth, Thomas (Author) , Inganäs, Olle (Author)
Format: Article (Journal)
Language:English
Published: 20 Nov 2019
In: Journal of materials chemistry. C, Materials for optical and electronic devices

ISSN:2050-7534
DOI:10.1039/C9TC05018C
Online Access:Verlag, Volltext: https://doi.org/10.1039/C9TC05018C
Verlag, Volltext: https://pubs.rsc.org/en/content/articlelanding/2019/tc/c9tc05018c
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Author Notes:Wanzhu Cai, Thomas Österberg, Mohammad Javad Jafari, Chiara Musumeci, Chuanfei Wang, Guangzheng Zuo, Xiaolong Yi, Xuhao Luo, Jim Johansson, Martijn Kemerink, Liangqi Ouyang, Thomas Ederth, and Olle Inganäs
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Summary:Transparent organic electrodes printed from high-conductivity PEDOT: PSS have become essential for upscaling all-carbon based, low-cost optoelectronic devices. In the printing process, low-work-function PEDOT: PSS electrodes (cathode) are achieved by coating an ultra-thin, non-conjugated polyelectrolyte that is rich in amine groups, such as poly (ethylene imine) (PEI) or its ethoxylated derivative (PEIE), onto PEDOT:PSS surfaces. Here we mapped the physical and chemical processes that occur at the interface between thin PEIx (indicating either PEI or PEIE) and PEDOT:PSS during printing. We identify that there is a dedoping effect of PEDOT induced by the PEIx. Using infrared spectroscopy, we found that the amine-rich PEIx can form chemical bonds with the dopant, PSS. At lower PSS concentration, PEIx also shows an electron-transfer effect to the charged PEDOT chain. These interface reactions lock the surface morphology of PEDOT: PSS, preventing the redistribution of PSS, and reduce the work function. Subsequent exposure to oxygen during the device fabrication process, on the other hand, can result in redoping of the low-work-function PEDOT: PSS interface, causing problems for printing reproducible devices at ambient conditions.
Item Description:Gesehen am 25.11.2019
Physical Description:Online Resource
ISSN:2050-7534
DOI:10.1039/C9TC05018C

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