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Adaptation des techniques de caractérisation basées sur des mesures de capacité et d’admittance aux cellules solaires multijonctions : expériences et modélisations

Abstract : The theoretical Shockley-Queisser radiative efficiency limit for single solar cells is around 30% and even silicon solar cells, which dominate the PV market, are very close to their performance limit with a record efficiency around 27%. The multi-junction (MJ) architecture is a strategy to reach or go over the 30% efficiency by combining semiconductor absorbers with appropriate bandgaps. However, the characterization of MJ solar cells can be much more complex than single junction cells. Indeed, for the two-terminal MJ architecture, the optical and electrical coupling between the subcells makes it challenging to characterize each subcell independently. In this thesis, we develop characterization techniques based on capacitance and admittance measurements and applied to MJ solar cells: capacitance-voltage (C(V)), admittance spectroscopy and deep-level transient spectroscopy (DLTS) techniques. These techniques are commonly used for single solar cells to determine doping densities (C(V)) or to study electrically active defects (admittance spectroscopy and DLTS), but only a few studies have been published about their use to characterize MJ cells at the subcell level. We show here it is possible to separate each subcell’s contribution to the cell capacitance by choosing illuminations such that one subcell is in the dark whereas the others absorb the light. Based on theoretical and numerical developments as well as experimental results performed on III-V/Si tandem cells, we present a detailed analysis of the techniques: subcell properties that can be extracted, influence of several experimental parameters (DC bias, frequency, temperature, light power…), limits and difficulties of the techniques. This work can be extended to other types of tandem cells like perovskite/Si or to MJ with more than two subcells.
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https://tel.archives-ouvertes.fr/tel-03150151
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Submitted on : Tuesday, February 23, 2021 - 3:30:13 PM
Last modification on : Thursday, February 25, 2021 - 3:27:21 AM

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  • HAL Id : tel-03150151, version 1

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Cyril Leon. Adaptation des techniques de caractérisation basées sur des mesures de capacité et d’admittance aux cellules solaires multijonctions : expériences et modélisations. Energie électrique. Université Paris-Saclay, 2020. Français. ⟨NNT : 2020UPAST038⟩. ⟨tel-03150151⟩

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