Finely tailored performance of inverted organic photovoltaics through layer-by-layer interfacial engineering

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DOIResolve DOI: http://doi.org/10.1021/am200849r
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TypeArticle
Journal titleACS Applied Materials and Interfaces
ISSN1944-8244
Volume3
Issue10
Pages39623970; # of pages: 9
SubjectCoated films; Electronic characteristics; Functionalizations; Indium tin oxide; Interfacial property; ITO electrodes; Layer number; Layer-by-layers; Odd-even effects; Organic photovoltaics; PEDOT:PSS; Poly(3 ,4-ethylenedioxythiophene); Power conversion efficiencies; Spectroscopic technique; Transparent conducting electrodes; UV photoelectron spectroscopy; UV visible spectroscopy; Atomic force microscopy; Atomic spectroscopy; Conducting polymers; Conversion efficiency; Ethylene; Indium compounds; Photons; Photovoltaic effects; Power supply circuits; Surface properties; Ultraviolet spectroscopy; Uninterruptible power systems; X ray photoelectron spectroscopy
AbstractControl over interfacial properties in organic photovoltaics (OPVs) is critical for many aspects of their performance. Functionalization of the transparent conducting electrode, in this case, indium tin oxide (ITO), through an electrostatic layer by layer (eLbL) approach with cationic N,N-bis[2-(trimethylammonium)ethylene] perylene-3,4,9,10-tetracarboxyldiimide (PTCDI +) and anionic poly(3,4-ethylenedioxythiophene):poly(p- styrenesulfonate) (PEDOT:PSS -), led to high control over the surface properties. The films were studied through a variety of surface and spectroscopic techniques, including X-ray photoelectron spectroscopy (XPS), UV-visible spectroscopy, atomic force microscopy (AFM), and ellipsometry. The work function of modified ITO was measured by UV photoelectron spectroscopy (UPS) and showed oscillating values with respect to odd-even layer numbers; the strong odd-even effect is due to the differing electronic characteristics of the top layer, either PTCDI + or PEDOT:PSS -. The modified ITO electrodes were then used as the cathode in a series of inverted organic photovoltaic architectures. The performance of inverted OPVs was, in parallel to the UPS results, found to be highly dependent on the layer number of coated films and showed an obvious oscillation based on layer number. Inverted OPVs were retested after 128 days of storage in air, and almost all devices maintained over 70% of original power conversion efficiency (PCE). © 2011 American Chemical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); National Institute for Nanotechnology
Peer reviewedYes
NPARC number21271957
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Record identifierba68ecd2-26ab-4db0-9205-2458b9299097
Record created2014-05-13
Record modified2016-05-09
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