Photonic Flash Sintering of Inkjet Printed Back Electrode for Organic Photovoltaic Application

Aldo Di Carlo^a, Francesca Brunetti^a, Giuseppina Polino^a^,^b, Robert Abbel^b, Guy J.P. Bex^b, Santhosh Shanmugam^c, Ronn Andriessen^c, Yulia Galagan^c

^aCHOSE- Centre for Hybrid and Organic Solar Energy, Department of Electronics Engineering, University of Rome “Tor Vergata”, Rome, Via Giacomo Peroni, Roma, Italy

^bHolst Centre, Solliance, NL, High Tech Campus, 21, Eindhoven, Netherlands

^cHolst Centre, Solliance, NL, High Tech Campus, 21, Eindhoven, Netherlands

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Giuseppina Polino, 172
Publication date: 5th February 2015

Towards Roll-to-Roll (R2R) processing, printing and coating are considered as a fast and cost-efficient method for the deposition of all layers in organic photovoltaic (OPV) devices, including both electrodes. The most common conductive inks used as an electrode material are based on silver nanoparticle dispersions, which require post-deposition sintering to achieve sufficient conductivities. Conventional thermal sintering can provide good conductivity, but requires long sintering time, which is not compatible with R2R processing. Alternative sintering methods that are able to accelerate the entire process without damaging the underlying layers and plastic substrates and are therefore in high demand. In particular, photonic flash sintering was successfully applied for the printed Ag current collecting grids deposited on a plastic substrate [1]. Whereas common plastic foils are typically transparent, silver nanoparticle inks are deeply coloured and strongly absorb visible light. Consequently, by choosing a lamp with an appropriate emission spectrum, energy can be coupled selectively into the printed ink structures without directly affecting the substrate. In this context the main challenge is to apply photonic flash sintering (PFS) for the back electrodes deposited at the top of the OPV stack containing ZnO, photoactive layer and PEDOT:PSS. We report the effect of flash sintering of back electrodes in OPV devices. The parameters are selected in such a way that minimize destructive effects of flash light on the photoactive layer. Organic solar cells with comparable device performance using both photonic flash sintering and conventional thermal sintering method were demonstrated.
J-V Characteristics comparison between thermal sintering and different setting of photonic flash sintering. Full area electrode (a) small area 0.089cm2,(b) large area 0.805cm2 ; Fingers (c) small area 0.089cm2 (d) large area 0.805cm2
[1]Yulia Galagan , Erica W.C. Coenen , Robert Abbel , Tim J. van Lammeren , Sami Sabik ,Marco Barink , Erwin R. Meinders , Ronn Andriessen , Paul W.M. Blom, Photonic sintering of inkjet printed current collecting grids for organic solar cell applications, Organic Electronics 14 (2013) 38–46

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