Fabrication of 'finger-geometry' silicon solar cells by electrochemical anodisation

G.F. Martins, A. J. R. Thompson, B. Goller, D. Kovalev, J.D. Murphy

Research output: Contribution to journalArticle

4 Citations (Scopus)

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 HO (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.
Original languageEnglish
Pages (from-to)2977-2985
JournalJournal of Materials Science
Volume48
Issue number7
DOIs
Publication statusPublished - Apr 2013

Fingerprint

Silicon solar cells
Silicon
Fabrication
Geometry
Substrates
Boron
Voltage measurement
Induced currents
Electric current measurement
Cost effectiveness
Electrolytes
Electron beams
Doping (additives)
Single crystals
Crystalline materials
Glass
Costs

Cite this

Martins, G. F., Thompson, A. J. R., Goller, B., Kovalev, D., & Murphy, J. D. (2013). Fabrication of 'finger-geometry' silicon solar cells by electrochemical anodisation. Journal of Materials Science, 48(7), 2977-2985. https://doi.org/10.1007/s10853-012-7075-x

Fabrication of 'finger-geometry' silicon solar cells by electrochemical anodisation. / Martins, G.F.; Thompson, A. J. R.; Goller, B.; Kovalev, D.; Murphy, J.D.

In: Journal of Materials Science, Vol. 48, No. 7, 04.2013, p. 2977-2985.

Research output: Contribution to journalArticle

Martins, GF, Thompson, AJR, Goller, B, Kovalev, D & Murphy, JD 2013, 'Fabrication of 'finger-geometry' silicon solar cells by electrochemical anodisation', Journal of Materials Science, vol. 48, no. 7, pp. 2977-2985. https://doi.org/10.1007/s10853-012-7075-x
Martins, G.F. ; Thompson, A. J. R. ; Goller, B. ; Kovalev, D. ; Murphy, J.D. / Fabrication of 'finger-geometry' silicon solar cells by electrochemical anodisation. In: Journal of Materials Science. 2013 ; Vol. 48, No. 7. pp. 2977-2985.
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