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 journalArticlepeer-review

4 Citations (SciVal)


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
Issue number7
Publication statusPublished - Apr 2013


Dive into the research topics of 'Fabrication of 'finger-geometry' silicon solar cells by electrochemical anodisation'. Together they form a unique fingerprint.

Cite this