Title: Aluminum electrode insulation dynamics via interface oxidation by reactant diffusion in organic layers
Authors : Fluhr, Daniel
Züfle, Simon
Muhsin, Burhan
Öttking, Rolf
Seeland, Marco
Roesch, Roland
Schubert, Ulrich S.
Ruhstaller, Beat
Krischok, Stefan
Hoppe, Harald
Published in : Physica status solidi A
Volume(Issue) : 215
Issue : 23
Publisher / Ed. Institution : Wiley
Issue Date: 2018
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : German
Subject (DDC) : 621.3: Electrical engineering and electronics
Abstract: Appreciable progress has been achieved in the development of organic photovoltaics (OPV) over the last decade. However, further improvement of operational stability remains a challenge. In this contribution, focus is placed on corrosion and delamination of the metal contact, which are mainly caused by oxygen or water vapor ingress but in other cases also via mechanical wear and different thermal expansion coefficients. So‐called pinholes and electrode edges provide pathways for ingress of water vapor and oxygen, which may attack the metal–organic interface. Thus, electrical insolation via formation of insulating metal oxide and concomitant mechanical delamination occurs. As charge injection and extraction is suppressed at insulated and delaminated areas, the active area contributing to power conversion gets reduced. This work links analytical and numerical predictions about the active area in contact with the electrode to experimentally observe dependencies. Spatially and time‐resolved electroluminescence measurements provide information on location, size, and growth‐rate of insulated areas. Area loss rates for dark spots depend either sub‐linear (for early stages and edge‐ingress) or linear (later stages) on time. The initial defect size has a clear impact on growth rates. Furthermore, it has possible to demonstrate titanium oxide interlayers to slow down this type of extrinsic degradation.
Further description : Article 1800474
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Publication type: Article in scientific Journal
DOI : 10.1002/pssa.201800474
ISSN: 1862-6300
1862-6319
0031-8965
URI: https://digitalcollection.zhaw.ch/handle/11475/15723
Appears in Collections:Publikationen School of Engineering

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