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Fabrication of ‘finger-geometry’ silicon solar cells by electrochemical anodisation
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Martins, G. F., Thompson, A. J. R., Goller, B., Kovalev, D. and Murphy, John D. (2013) Fabrication of ‘finger-geometry’ silicon solar cells by electrochemical anodisation. Journal of Materials Science, Vol.48 (No.7). pp. 2977-2985. doi:10.1007/s10853-012-7075-x ISSN 0022-2461.
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Official URL: http://dx.doi.org/10.1007/s10853-012-7075-x
Abstract
Cells made from crystalline silicon dominate the market for photovoltaics, but improvements in cost-effectiveness are still necessary for uptake to increase. In this paper, we investigate the fabrication of a cell structure which has the potential to be compatible with cheap low-purity silicon substrates. In our cell design the charge-collecting p–n junction protrudes into the substrate like fingers, thus significantly reducing the required carrier diffusion length compared to a front planar junction cell. The macroporous structure is created by electrochemical anodisation of an n-type silicon substrate in an HF and H2O2 (aqueous) electrolyte. The pores are loaded with a boron-containing glass which is then annealed to diffuse the dopant into the silicon substrate forming a volume junction. The anodisation conditions have been optimised using intentionally contaminated single-crystal silicon as a model system. We characterise the junction formed by electron beam induced current and current–voltage measurements. The anodisation study is extended to n-type multicrystalline silicon and it is found that the orientation of the grains strongly influences the geometry of the pores formed. The potential for using this cell structure for low-cost photovoltaics is discussed and potential problems are highlighted.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
Journal or Publication Title: | Journal of Materials Science | ||||
Publisher: | Springer | ||||
ISSN: | 0022-2461 | ||||
Official Date: | 2013 | ||||
Dates: |
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Volume: | Vol.48 | ||||
Number: | No.7 | ||||
Page Range: | pp. 2977-2985 | ||||
DOI: | 10.1007/s10853-012-7075-x | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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