University of Oulu

Ylikunnari, M., Välimäki, M., Väisänen, K.-L., Kraft, T. M., Sliz, R., Corso, G., Po, R., Barbieri, R., Carbonera, C., Gorni, G., & Vilkman, M. (2020). Flexible OPV modules for highly efficient indoor applications. Flexible and Printed Electronics, 5(1), 14008.

Flexible OPV modules for highly efficient indoor applications

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Author: Ylikunnari, Mari1; Välimäki, Marja1; Väisänen, Kaisa-Leena1;
Organizations: 1VTT Technical Research Centre of Finland, Kaitoväylä 1, FI-90571 Oulu, Finland
2University of Oulu, Optoelectronics and measurement techniques laboratory, 90014 University of Oulu, Finland
3Eni S.p.A, Renewable Energy & Environmental R&D, Via Fauser 4, 28100 Novara, Italy
4VTT Technical Research Centre of Finland, Tietotie 3, FI-02150 Espoo, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.6 MB)
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Language: English
Published: IOP Publishing, 2020
Publish Date: 2021-02-12


The comparison of solution processed organic photovoltaics with two roll-to-roll coated electron transport layers (ETL), as well as printed grid or solid back electrodes provides insight into the future of R2R fabricated architectures. The variation in performance of the R2R slot-die coated zinc oxide (ZnO) versus the tin oxide (SnO2), showed a clear dependence on the spectrum of the illumination source. It was found that under indoor light conditions (200–1000 lux LED and fluorescent sources) the SnO2 outperformed the ZnO with highest efficiencies near 13% and 10% respectively. This is in contrast to results obtained under 1 Sun (AM 1.5) in which the cells fabricated with a ZnO ETL had a higher power conversion efficiency than those prepared with SnO2. The results also confirm the significance of the layout of the printed silver back contact; in which cells with the grid structure outperformed those with full coverage by approximately 35% for ZnO and just under 10% for SnO2 (all light conditions). The combination of a R2R coating and S2S printing process to prepare modules with 8 cells in series (PET/ITO/SnO2/PV2001:PCBM/PEDOT:PSS/silver grid) resulted in a PCE of 13.4% under indoor office light conditions.

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Series: Flexible and printed electronics
ISSN: 2058-8585
ISSN-E: 2058-8585
ISSN-L: 2058-8585
Volume: 5
Issue: 1
Article number: 014008
DOI: 10.1088/2058-8585/ab6e73
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
216 Materials engineering
Copyright information: © 2020 IOP Publishing Ltd. CC BY-NC-ND 3.0.