The effect of organic and metal oxide interfacial layers on the performance of inverted organic photovoltaics

Savva A, Petraki F, Elefteriou P, Sygellou L, Voigt M, Giannouli M, Kennou S, Nelson J, Bradley DDC, Brabec C, Choulis SA (2013)

Publication Type: Journal article

Publication year: 2013

Journal

Advanced Energy Materials Wiley

Book Volume: 3

Pages Range: 391-398

Journal Issue: 3

DOI: 10.1002/aenm.201200317

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. © 2013 WILEY-VCH Verlag GmbH and Co. © 2013 WILEY-VCH Verlag GmbH & Co.

Authors with CRIS profile

Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET)

Involved external institutions

Cyprus University of Technology (CUT) / Τεχνολογικό Πανεπιστήμιο Κύπρου CY Cyprus (CY) University of Patras (UPATRAS) GR Greece (GR) Imperial College London / The Imperial College of Science, Technology and Medicine GB United Kingdom (GB)

How to cite

APA:

Savva, A., Petraki, F., Elefteriou, P., Sygellou, L., Voigt, M., Giannouli, M.,... Choulis, S.A. (2013). The effect of organic and metal oxide interfacial layers on the performance of inverted organic photovoltaics. Advanced Energy Materials, 3(3), 391-398. https://doi.org/10.1002/aenm.201200317

MLA:

Savva, Achilleas, et al. "The effect of organic and metal oxide interfacial layers on the performance of inverted organic photovoltaics." Advanced Energy Materials 3.3 (2013): 391-398.

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