>21% efficient silicon heterojunction solar cells on n-and p-type wafers compared

Antoine Descoeudres, Zachary C. Holman, Loris Barraud, Sophie Morel, Stefaan De Wolf, Christophe Ballif

Research output: Contribution to journalArticle

151 Scopus citations

Abstract

The properties and high-efficiency potential of front-and rear-emitter silicon heterojunction solar cells on n-and p-type wafers were experimentally investigated. In the low-carrier-injection range, cells on p-type wafers suffer from reduced minority carrier lifetime, mainly due to the asymmetry in interface defect capture cross sections. This leads to slightly lower fill factors than for n-type cells. By using high-quality passivation layers, however, these losses can be minimized. High open-circuit voltages (Vocs) were obtained on both types of float zone (FZ) wafers: up to 735 mV on n-type and 726 mV on p-type. The best Voc measured on Czochralski (CZ) p-type wafers was only 692 mV, whereas it reached 732 mV on CZ n-type. The highest aperture-area certified efficiencies obtained on 4 cm2 cells were 22.14% (Voc=727mV , FF = 78.4%) and 21.38% (Voc =722mV, FF = 77.1%) on n-and p-type FZ wafers, respectively, proving that heterojunction schemes can perform almost as well on high-quality p-type as on n-type wafers. To our knowledge, this is the highest efficiency ever reported for a full silicon heterojunction solar cell on a p-type wafer, and the highest V oc on any p-type crystalline silicon device with reasonable FF.

Original languageEnglish (US)
Article number6263260
Pages (from-to)83-89
Number of pages7
JournalIEEE Journal of Photovoltaics
Volume3
Issue number1
DOIs
StatePublished - Jan 1 2013
Externally publishedYes

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Keywords

  • Amorphous silicon
  • crystalline silicon
  • heterojunctions
  • photovoltaic cells

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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