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Issue 47, 2018
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Baking soda: an ultra-cheap and air stable electron injection layer for organic electronic devices

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Abstract

To realize high performance printed organic optoelectronic devices, the development of air-stable, cheap, and solution-processable electron injection layers (EILs) is urgently required to avoid the use of a low work-function metal electrode with poor air stability. We report sodium bicarbonate (baking soda, NaHCO3) as an efficient, low-cost, air-stable, and environmentally friendly EIL material in various printed organic electronic devices including organic solar cells (OSCs), organic light-emitting diodes (OLEDs), organic photodiodes (OPDs) and n-channel organic thin film transistors (OFETs). UV photoelectron spectroscopy results indicated that the work-function of various common electrodes used for organic devices such as ITO, Au, Al and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) decreased significantly by more than 1 eV following deposition of a thin NaHCO3 film. The performance and stability of these organic devices improved by around 15% overall with ultra-cheap, air stable EILs. In particular, high performance OSCs based on PTB7:PC71BM with a power conversion efficiency of 8.40% and solution processed OLEDs based on PVK:PBD:Ir(ppy)3 with light emitting efficiencies of 68.5 cd A−1 and 20 lm A−1 were achieved by applying a NaHCO3 interlayer.

Graphical abstract: Baking soda: an ultra-cheap and air stable electron injection layer for organic electronic devices

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Publication details

The article was received on 03 Sep 2018, accepted on 05 Nov 2018 and first published on 06 Nov 2018


Article type: Paper
DOI: 10.1039/C8TC04421J
J. Mater. Chem. C, 2018,6, 12871-12878

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    Baking soda: an ultra-cheap and air stable electron injection layer for organic electronic devices

    D. X. Long and Y. Noh, J. Mater. Chem. C, 2018, 6, 12871
    DOI: 10.1039/C8TC04421J

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