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Application of laser-spectroscopy on organic photovoltaic devices

: Banerjee, Shyama Prasad; Sarnet, Thierry; Kuntze, Thomas; Fledderus, Henri; Salem, Ahmed; Akkerman, Hylke B.; Friedrich-Schilling, Niels; Gburek, Benedikt; Anderson, Merve; Cros, Stephane; Sentis, Marc

Wissenschaftliche Gesellschaft Lasertechnik -WLT-:
International Conference on Lasers in Manufacturing, LiM 2017 : Munich ICM, Internationales Congress Center München, Germany, June 26-29, 2017, CD-ROM
München: Wissenschaftliche Gesellschaft Lasertechnik e.V., 2017
4 pp.
International Conference on Lasers in Manufacturing (LiM) <2017, Munich>
World of Photonics Congress <2017, Munich>
European Commission EC
H2020; 644026; ALABO
Advanced laser ablation barrier films for organic and large area electronic devices
Conference Paper
Fraunhofer IWS ()
Kunststoffsubstrat; material identification; selective ablation; organische Schicht; front electrode

Organic photovoltaics (OPV) with integrated ultra-barrier layer instead of afterward encapsulation are advantageous due to combination of functionalities: substrate for layered stack generation and protection against lifetime-limiting climatic exposure. Additionally, integration of the barrier into the functional layer stack saves one encapsulation step in the production. European H2020 project ALABO (Advanced Laser Ablation on Barrier films for Organic and large area electronic devices), addresses the challenges of lifetime enhancement and performance-cost-ratio . The consortium includes 3 multi-national industries, 3 research institutes and 1 university from 4 European countries. To include an ultra-barrier layer onto the plastic substrate with functional opto-electrical layers on top and qualification of a roll-to-toll (R2R) suitable production process, implies development of adequate coating, laser structuring and characterization processes. Laser structuring of the front electrode (indium-tin-oxide ITO or dielectric-metal-dielectric DMD; P1 scribing), the electric energy generating organic layer (P2 scribing) and the back electrode layer (P3 scribing) are potentially harmful to the thin-film barrier underneath. Therefore, P1-P3 laser process development goes hand-in-hand with barrier performance characterization and performed by water vapour transmission rate (WVTR) measurements using tunable diode laser absorption spectroscopy (TDLAS), He-transmission-test, in-house developed optical Ca-test and Hyper-spectral Imaging (HSI). A real time diagnostic setup for selective ablation during laser scribing using laser-induced breakdown spectroscopy (LIBS) technique was investigated to obtain the material identification at every laser pulse. The paper presents results of femtosecond and picoseconds LIBS, which generally enable discrimination of the separate laser-machined nm-scale layers by their corresponding emission lines.