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Performance et durée de vie des architectures photovoltaïques organiques tandems

Abstract : Organic photovoltaics is a promising technology with many advantages: flexibility, lightness, conformability, and low manufacturing costs. The only limiting factors to its commercialization are the moderate efficiency and the limited lifetime of the devices. One strategy that can increase its efficiency is the use of a tandem architecture which consists of a stack of two subcells with complementary absorption spectra. However, no study has been done on the stability of these devices. The objective of this thesis is to design high-performance tandem cells and study their stability under illumination AM1.5 1000 W/m². As a first step, the optimization of single cells allowed us to achieve efficiencies from 2.7% to 5.6% on average. These devices were then combined to form a tandem cell with the support of an optical simulation tool. This resulted in efficiency close to 7% and a gain of 1% on average compared to the best simple junction devices. A stability study was then carried out using a systemic approach to the optical (UV-Visible), optoelectronic (EQE and J (V)) and electronic (Impedance Spectroscopy and SKP) properties of single and double junction devices and of the materials themselves. Decreases in performance were observed, which are related to a degradation mainly caused by the acceptor molecules. Any prolongation in the lifetime of sub-cells in tandem architecture can be explained by a filter effect. Finally, a preliminary study of impedance spectroscopy applied to tandem cells is presented. This technique would allow us to follow the degradation of each sub-cell independently directly in the tandem architecture.Keywords : organic tandem solar cell, optical simulation, ageing, impedance spectroscopy, dimerization, degradation, PC71BM.
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Submitted on : Thursday, December 14, 2017 - 9:06:08 AM
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Guillaume Schuchardt. Performance et durée de vie des architectures photovoltaïques organiques tandems. Construction durable. Université Grenoble Alpes, 2017. Français. ⟨NNT : 2017GREAA004⟩. ⟨tel-01663559⟩

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