Zhang, H*; Borgschulte, A*; Castro, F A; Crockett, R*; Gerecke, A C*; Deniz, O*; Heier, J*; Jenatsch, S*; Nuesch, F*; Sanchez-Sanchez, C*; Zoladek-Lemanczyk, A*; Hany, R* (2015) Photochemical transformations in fullerene and molybdenum oxide affect the stability of bilayer organic solar cells. Adv. Energy Mater., 5 (2). 1400734

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Abstract

Thin films of fullerene C60 and molybdenum oxide (MoO3) are ubiquitously used as electron acceptor material and hole extraction interfacial layer for the fabrication of organic photovol-taic (OPV) cells. It is well known that light exposure induces color changes in MoO3 (photo-chromism) and the formation of intermolecular bonds between C60 molecules (photopolymeri-zation). The influence of these photoinduced reactions on the long-term stability of OPV cells, however, has not been studied in detail so far. We present a study and discuss the early (< 5 days) aging mechanisms occurring in illuminated ITO/MoO3/organic dye/C60/Ag bilayer solar cells under nitrogen atmosphere. We identify that a delamination process at the organic het-erojunction and the formation of Mo5+ species during illumination adversely affect cell behav-iour. For these widely used materials, our results suggest that light processing is a first neces-sary step before OPV characteristics can be meaningfully rated.

Item Type:	Article
Keywords:	fullerene, molybdenum oxide, Raman
Subjects:	Advanced Materials Advanced Materials > Photovoltaics
Identification number/DOI:	10.1002/aenm.201400734
Last Modified:	02 Feb 2018 13:13
URI:	http://eprintspublications.npl.co.uk/id/eprint/6483

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