Optimized multilayer indium-free electrodes for organic photovoltaics

Gentle, Angus R., Yambem, Soniya D., Smith, Geoff B., Burn, Paul L. and Meredith, Paul (2015) Optimized multilayer indium-free electrodes for organic photovoltaics. Physica Status Solidi A: Applications and Materials Science, 212 2: 348-355. doi:10.1002/pssa.201431469

Author Gentle, Angus R.
Yambem, Soniya D.
Smith, Geoff B.
Burn, Paul L.
Meredith, Paul
Title Optimized multilayer indium-free electrodes for organic photovoltaics
Journal name Physica Status Solidi A: Applications and Materials Science   Check publisher's open access policy
ISSN 1862-6319
Publication date 2015-02
Year available 2014
Sub-type Article (original research)
DOI 10.1002/pssa.201431469
Open Access Status
Volume 212
Issue 2
Start page 348
End page 355
Total pages 8
Place of publication Weinheim, Germany
Publisher Wiley-VCH Verlag
Collection year 2015
Language eng
Abstract Flexible multilayer electrodes that combine high transparency, high conductivity, and efficient charge extraction have been deposited, characterised and used as the anode in organic solar cells. The anode consists of an AZO/Ag/AZO stack plus a very thin oxide interlayer whose ionization potential is fine-tuned by manipulating its gap state density to optimise charge transfer with the bulk heterojunction active layer consisting of poly(n-3-hexylthiophene-2,5-diyl) and phenyl-C61-butyric acid methyl ester (P3HT:BC61BM). The deposition method for the stack was compatible with the low temperatures required for polymer substrates. Optimisation of the electrode stack was achieved by modelling the optical and electrical properties of the device and a power conversion efficiency of 2.9% under AM1.5 illumination compared to 3.0% with an ITO-only anode and 3.5% for an ITO:PEDOT electrode. Dark I–V reverse bias characteristics indicate very low densities of occupied buffer states close to the HOMO level of the hole conductor, despite observed ionization potential being high enough. Their elimination should raise efficiency to that with ITO:PEDOT.
Keyword Flexible electrodes
Indium tin oxide
Multilayer electrodes
Organic solar cells
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online ahead of print 9 Oct 2014

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2015 Collection
School of Chemistry and Molecular Biosciences
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