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Journal Articles Nanotechnology Year : 2012

Radial junction amorphous silicon solar cells on PECVD-grown silicon nanowires

Abstract

Constructing radial junction hydrogenated amorphous silicon (a-Si:H) solar cells on top of silicon nanowires (SiNWs) represents a promising approach towards high performance and cost-effective thin film photovoltaics. We here develop an all-in situ strategy to grow SiNWs, via a vapour-liquid-solid (VLS) mechanism on top of ZnO-coated glass substrate, in a plasma-enhanced chemical vapour deposition (PECVD) reactor. Controlling the distribution of indium catalyst drops allows us to tailor the as-grown SiNW arrays into suitable size and density, which in turn results in both a sufficient light trapping effect and a suitable arrangement allowing for conformal coverage of SiNWs by subsequent a-Si:H layers. We then demonstrate the fabrication of radial junction solar cells and carry on a parametric study designed to shed light on the absorption and quantum efficiency response, as functions of the intrinsic a-Si:H layer thickness and the density of SiNWs. These results lay a solid foundation for future structural optimization and performance ramp-up of the radial junction thin film a-Si:H photovoltaics.

Dates and versions

hal-00757361 , version 1 (26-11-2012)

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Linwei Yu, Benedict O'Donnell, Martin Foldyna, Pere Roca I. Cabarrocas. Radial junction amorphous silicon solar cells on PECVD-grown silicon nanowires. Nanotechnology, 2012, 23, pp.4011. ⟨10.1088/0957-4484/23/19/194011⟩. ⟨hal-00757361⟩
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