Rear surface effects in high efficiency silicon solar cells

S. R. Wenham, S. J. Robinson, X. Dai, J. Zhao, A. Wang, Y. H. Tang, A. Ebong, Christiana Honsberg, M. A. Green

Research output: Chapter in Book/Report/Conference proceedingConference contribution

42 Scopus citations


Rear surface effects in PERL solar cells can lead not only to degradation in the short circuit current and open circuit voltage, but also fill factor. Three mechanisms capable of changing the effective rear surface recombination velocity with injection level are identified, two associated with oxidised p-type surfaces, and the third with two dimensional effects associated with a rear floating junction. Each of these will degrade the fill factor if the range of junction biases corresponding to the rear surface transition, coincides with the maximum power point. Despite the identified non idealities, PERL cells with rear floating junctions (PERF cells) have achieved record open circuit voltages for silicon solar cells, while simultaneously achieving fill factor improvements relative to standard PERL solar cells. Without optimisation, a record efficiency of 22% has been demonstrated for a cell with a rear floating junction. The results of both theoretical and experimental studies are provided.

Original languageEnglish (US)
Title of host publicationConference Record of the IEEE Photovoltaic Specialists Conference
Editors Anon
Number of pages5
StatePublished - 1994
Externally publishedYes
EventProceedings of the 24th IEEE Photovoltaic Specialists Conference. Part 2 (of 2) - Waikoloa, HI, USA
Duration: Dec 5 1994Dec 9 1994


OtherProceedings of the 24th IEEE Photovoltaic Specialists Conference. Part 2 (of 2)
CityWaikoloa, HI, USA

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Condensed Matter Physics


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