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Optimization of the interfaces of encapsulated OPV devices

Abstract : In order to limit the flexible organic photovoltaic devices degradation induced by moisture andoxygen, the solar cells are encapsulated between two gas-barrier films. Despite the importanceof the encapsulation processes and their potential influence on the initial performances as well asduring aging of the devices, they are scarcely described in the literature. Furthermore, severalfield aging studies showed that mechanical degradation could limit the devices lifetime beforetheir photo-chemical stability became an issue. Thus, adhesion between the different layerscomposing the devices is a critical factor in order to develop flexible OPV devices reliable aftertheir manufacturing and during their use.In this work, two encapsulation protocols were studied: the roll-to-roll lamination of apressure sensitive adhesive and the vacuum lamination of a hotmelt thermoplastic. In order toquantify the adhesion strength of every interface comprised in the samples, the 180° peelingtest mechanical characterization was adapted for and then applied to the flexible devices. Inaddition, non-destructive imaging characterization techniques were developed: the laser-beaminduced-current mapping and the luminescence emission imaging under optical and electricalexcitation. Thank to these techniques, the hypothesis of a mechanical degradation occurringduring the roll-to-roll lamination process was made. Answers allowing for the improvement ofthe interfaces identified as weak were searched for and evaluated with respect to the photovoltaicperformances of the reference devices. The imaging techniques previously developed were alsoapplied along the accelerated aging of encapsulated cells. A mechanism was proposed, whichallows one to explain the localization of the degradation but also the failure type, either opticalor electrical, occurring during each aging step.
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https://tel.archives-ouvertes.fr/tel-01859569
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Submitted on : Wednesday, August 22, 2018 - 11:59:06 AM
Last modification on : Tuesday, October 6, 2020 - 4:18:02 PM
Long-term archiving on: : Friday, November 23, 2018 - 2:07:42 PM

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Sacha Juillard. Optimization of the interfaces of encapsulated OPV devices. Chemical engineering. Université Grenoble Alpes, 2018. English. ⟨NNT : 2018GREAI033⟩. ⟨tel-01859569⟩

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