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Title: The effect of organic and metal oxide interfacial layers on the performance of inverted organic photovoltaics
Authors: Savva, Achilleas 
Petraki, Foteini 
Eleftheriou, Polyvios 
Sygellou, Lamprini 
Voigt, Monika M. 
Giannouli, Myrsini 
Kennou, Stella 
Nelson, Jenny M. 
Bradley, Donal D.C. 
Brabec, Christoph J. 
Choulis, Stelios A. 
Major Field of Science: Engineering and Technology
Field Category: Mechanical Engineering
Keywords: Organic photovoltaics;Interfacial layer
Issue Date: Mar-2013
Source: Advanced Energy Materials, 2013, vol. 3, no. 3, pp. 391-398
Volume: 3
Issue: 3
Start page: 391
End page: 398
Journal: Advanced Energy Materials 
Abstract: We study the origin of the improvement of the power conversion effi ciency (PCE) of inverted organic solar cells when an interfacial insulating organic layer of polyoxyethylene tridecyl ether (PTE) is introduced between the indium tin oxide (ITO) bottom electrode and the TiOx interfacial layer. XPS and UPS measurements are used to investigate the energy level alignment at the interfaces within the ITO/TiOx and ITO/PTE/TiOx structures and to identify any effects due to chemical interaction and interfacial dipoles. Scanning electron microscopy studies show that the surface structure of the TiOx layer is affected, when it is coated on top of the PTE layer. Surface contact angle measurements show that the incorporated interfacial layer of PTE is more hydrophilic than ITO and thus PTE modifi ed TiO x becomes more hydrophilic. This, in combination with the surface gaps of the PTE interfacial layer, is likely to lead to changed wetting and hydrolysis properties of TiOx when coated on ITO/PTE than on ITO alone. The different TiOx layer quality is refl ected in improved electron selectivity, leading to enhanced fi ll factor, reduced parasitic resistance effects and higher power conversion effi ciency for inverted solar cells with a PTE interfacial layer between ITO and TiOx.
ISSN: 1614-6832
DOI: 10.1002/aenm.201200317
Rights: © WILEY
Type: Article
Affiliation : Cyprus University of Technology 
University of Patras 
Institute of Chemical Engineering and High Temperature Chemical Processes 
Friedrich-Alexander University Erlangen-Nuremberg 
Imperial College London 
University of Oxford 
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