La croissance plasma de nanofils de silicium catalysée par l'étain et l'indium et applications dans les cellules solaires à jonctions radiales.

Abstract : In this thesis, disordered arrays of vertical silicon nanowires are used to trap light in PECVD-deposited silicon solar cells. The abrupt surface which they present can absorb light efficiently and be manufactured in the same vacuum run as the other layers of the cell, offering the prospect of dispensing with the additional fabrication steps conventionally required to texture the substrates of thin-film photovoltaics. Drops of liquid tin and indium, designed to catalyze the growth of silicon nanowires, were deposited and rearranged on transparent conducting oxide substrates under vacuum to obtain metal drop configurations with diameters and densities spanning several orders of magnitude. In discussing the suitability of different metals to catalyze the growth of silicon nanowires, we have highlighted distinctions between the behavior of transition and non-transition metals for vapor-liquid-solid growth and studied in particular the case of silicon nanowires catalyzed by tin. Nanowires doped P-type with the appropriate morphology were covered in conformal layers of intrinsic and N-type hydrogenated amorphous silicon, and an indium-tin-oxide electrical contact to produce networks of 107 radial PIN junctions connected over areas of 3.1 mm². Optimizing the fabrication process of these devices has led to open-circuit voltages of 0.8 V and short-circuit currents of 13 mA/cm². The cells are deposited over untextured substrates using techniques which are compatible with a single pump-down process. Their ability to trap light rivals that of established texturing techniques and their performance comes close to that of planar PIN structures.
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Contributor : Benedict O'Donnell <>
Submitted on : Wednesday, December 5, 2012 - 4:49:16 PM
Last modification on : Wednesday, March 27, 2019 - 4:20:04 PM
Long-term archiving on : Wednesday, March 6, 2013 - 5:06:13 PM

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Benedict O'Donnell. La croissance plasma de nanofils de silicium catalysée par l'étain et l'indium et applications dans les cellules solaires à jonctions radiales.. Science des matériaux [cond-mat.mtrl-sci]. Ecole Polytechnique X, 2012. Français. ⟨pastel-00761566⟩

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