Record infrared internal quantum efficiency in silicon heterojunction solar cells with dielectric/metal rear reflectors

Zachary Holman, Antoine Descoeudres, Stefaan De Wolf, Christophe Ballif

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

Inserting a dielectric between the absorber and rear metal electrode of a solar cell increases rear internal reflectance by both limiting the transmission cone and suppressing the plasmonic absorption of light arriving outside of the cone. We fabricate rear reflectors with low-refractive-index magnesium fluoride (MgF 2) as the dielectric, and with local electrical contacts through the MgF2 layer. These MgF2/metal reflectors are introduced into amorphous silicon/crystalline silicon heterojunction solar cells in place of the usual transparent conductive oxide/metal reflector. An MgF 2/Ag reflector yields an average rear internal reflectance of greater than 99.5% and an infrared internal quantum efficiency that exceeds that of the world-record UNSW PERL cell. An MgF 2/Al reflector performs nearly as well, enabling an efficiency of 21.3% and a short-circuit current density of nearly 38 mA/cm2 in a silicon heterojunction solar cell without silver or indium tin oxide at the rear.

Original languageEnglish (US)
Article number6587478
Pages (from-to)1243-1249
Number of pages7
JournalIEEE Journal of Photovoltaics
Volume3
Issue number4
DOIs
StatePublished - 2013

Fingerprint

Silicon
Quantum efficiency
reflectors
Heterojunctions
heterojunctions
quantum efficiency
Solar cells
solar cells
Metals
Infrared radiation
Cones
silicon
metals
Wave transmission
Tin oxides
Amorphous silicon
cones
Silver
Short circuit currents
Indium

Keywords

  • Heterojunction
  • light trapping
  • magnesium fluoride
  • parasitic absorption
  • reflector
  • silicon
  • solar cell

ASJC Scopus subject areas

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

Cite this

Record infrared internal quantum efficiency in silicon heterojunction solar cells with dielectric/metal rear reflectors. / Holman, Zachary; Descoeudres, Antoine; De Wolf, Stefaan; Ballif, Christophe.

In: IEEE Journal of Photovoltaics, Vol. 3, No. 4, 6587478, 2013, p. 1243-1249.

Research output: Contribution to journalArticle

Holman, Zachary ; Descoeudres, Antoine ; De Wolf, Stefaan ; Ballif, Christophe. / Record infrared internal quantum efficiency in silicon heterojunction solar cells with dielectric/metal rear reflectors. In: IEEE Journal of Photovoltaics. 2013 ; Vol. 3, No. 4. pp. 1243-1249.
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