Strategies for Doped Nanocrystalline Silicon Integration in Silicon Heterojunction Solar Cells

Johannes P. Seif, Antoine Descoeudres, Gizem Nogay, Simon Hanni, Silvia Martin De Nicolas, Niels Holm, Jonas Geissbuhler, Aicha Hessler-Wyser, Martial Duchamp, Rafal E. Dunin-Borkowski, Martin Ledinsky, Stefaan De Wolf, Christophe Ballif

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

Carrier collection in silicon heterojunction (SHJ) solar cells is usually achieved by doped amorphous silicon layers of a few nanometers, deposited at opposite sides of the crystalline silicon wafer. These layers are often defect-rich, resulting in modest doping efficiencies, parasitic optical absorption when applied at the front of solar cells, and high contact resistivities with the adjacent transparent electrodes. Their substitution by equally thin doped nanocrystalline silicon layers has often been argued to resolve these drawbacks. However, low-Temperature deposition of highly crystalline doped layers of such thickness on amorphous surfaces demands sophisticated deposition engineering. In this paper, we review and discuss different strategies to facilitate the nucleation of nanocrystalline silicon layers and assess their compatibility with SHJ solar cell fabrication. We also implement the obtained layers into devices, yielding solar cells with fill factor values of over 79% and efficiencies of over 21.1%, clearly underlining the promise this material holds for SHJ solar cell applications.

Original languageEnglish (US)
Article number7494651
Pages (from-to)1132-1140
Number of pages9
JournalIEEE Journal of Photovoltaics
Volume6
Issue number5
DOIs
StatePublished - Sep 1 2016
Externally publishedYes

Keywords

  • Microcrystalline silicon
  • nanocrystalline silicon
  • silicon heterojunctions (SHJs)
  • solar cells

ASJC Scopus subject areas

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

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