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Interlaboratory indoor ageing of roll-to-roll and spin coated organic photovoltaic devices: Testing the ISOS test.

Gevorgyan, S A*; Corazza, M*; Madsen, M V*; Bardizza, G*; Pozza, A*; Mullejans, H*; Blakesley, J C; Dibb, G F A; Castro, F A; Trigo, J F*; Guillen, C M*; Herrero, J R*; Morvillo, P*; Maglione, M G*; Minarini, C*; Roca, F*; Cros, S*; Seraine, C*; Law, C H*; Tuladhar, P S*; Durrant, J R*; Krebs, F C* (2014) Interlaboratory indoor ageing of roll-to-roll and spin coated organic photovoltaic devices: Testing the ISOS test. Polymer Degradation and Stability, 109. pp. 162-170.

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The prediction and inter-comparability of the lifetime of organic photovoltaic technologies are addressed. Four primary factors that affect the reproducibility of the lifetime prediction and inter-comparison are discussed: production/encapsulation of the samples, electrical characterization, ageing test conditions (ISOS) and lifetime determination from a decay curve.
Results of inter-laboratory lifetime studies of roll-to-roll and spin coated samples with correspondingly flexible plastic packaging and glass encapsulation tested under dark ISOS test conditions among 7 laboratories are presented. The reproducibility of the performance versus the production and encapsulation techniques is firstly studied. The results reveal a significant improvement in the reproducibility when going from manual spin coating to roll-to-roll production. Further, the reproducible IV scanning and light soaking treatments are addressed. Additionally, the inter-comparison of the degradation rates under the three ISOS-D-1, 2 & 3 conditions reported by different group are analyzed revealing a reasonable agreement among the measurements. Finally, a logarithmic lifetime diagram with time units is proposed that allows categorizing the lifetime of different technologies tested under different test conditions easing the intercomparison and eventually the determination of acceleration factors. The performance of the samples tested under harsh ISOS-D-3 and the light ISOS-D-1&2 is presented and discussed using the lifetime diagram.

Item Type: Article
Keywords: photovoltaic, organic solar cell, degradation, round robin
Subjects: Advanced Materials
Advanced Materials > Photovoltaics
Identification number/DOI: 10.1016/j.polymdegradstab.2014.07.013
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/6459

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