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Étude de dispositifs photovoltaïques à hétérojonctions a-Si˸H/c-Si : caractérisations vs. simulations en régime modulé de structures planaires et modélisations optoélectroniques de nanofils à structure radiale

Abstract : In the context of the research on improving performances and reducing costs of silicon-based solar cells, we focused on heterojunctions between hydrogenated amorphous silicon (a-Si:H) and crystalline silicon (c-Si). On the one hand, we studied the application of the Modulated PhotoCurrent technique (MPC) as a tool for characterizing the a-Si:H/c-Si interface and which we coupled to the Modulated PhotoLuminescence technique (MPL) widely used to study the quality of interface passivation. We characterized by these two techiques a serie of samples composed of (p)a-Si:H/(i)a-Si:H/(n)c-Si with a thickness of (i)a-Si:H going from 2 to 50 nm. An important part of this study was made by 2D numerical simulations in order to interpret our experimental results. We showed that both techniques give the same estimation of the density of interface defects between (i)a-Si:H and (n)c-Si. On the other hand, we developped a tool for coupling electrical and optical simulations for the design of nanowire-based solar cells with a radial heterojunction. Formerly, these simulations were most of the time performed separately and therefore were not allowing for a complete study of these kind of structures. We then made a study showing how the conditions of electrical contacts of nanowires affect the performances of these solar cells.
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https://tel.archives-ouvertes.fr/tel-02068957
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Submitted on : Friday, March 15, 2019 - 1:06:06 PM
Last modification on : Tuesday, September 29, 2020 - 4:50:40 AM

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  • HAL Id : tel-02068957, version 1

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Alexandra Levtchenko. Étude de dispositifs photovoltaïques à hétérojonctions a-Si˸H/c-Si : caractérisations vs. simulations en régime modulé de structures planaires et modélisations optoélectroniques de nanofils à structure radiale. Science des matériaux [cond-mat.mtrl-sci]. Université Paris Saclay (COmUE), 2019. Français. ⟨NNT : 2019SACLS028⟩. ⟨tel-02068957⟩

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