Vertical junction Si cells for concentrating photovoltaics

Roni Pozner, Gideon Segev, Rona Sarfaty, Abraham Kribus, Yossi Rosenwaks*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Vertical junction Si cell has shown a potential to operate at high concentrations, mainly the result of reduced series resistance losses due to its low-current/high-voltage design, but tests and analyses have so far only shown a modest efficiency of about 20%. We perform a comprehensive optimization study and show that the conversion efficiency of vertical multi-junction (VMJ) cells can be significantly higher, close to 30% at concentrations of 1000 and higher. Reaching this efficiency requires junction dimensions that are significantly smaller than previous VMJ cells. This may require a different approach in the fabrication process, possibly by using a monolithic method rather than the wafer stacking approach. We also show that increased photoconductivity, which is usually negligible in conventional cells, produces a significant reduction in series resistance at high concentrations making it a significant contributor to the outstanding performance of the VMJ cell at high concentration.

Original languageEnglish
Pages (from-to)197-208
Number of pages12
JournalProgress in Photovoltaics: Research and Applications
Volume20
Issue number2
DOIs
StatePublished - Mar 2012

Keywords

  • concentrating
  • photovoltaics
  • vertical junction

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