Surface passivation properties of stacked doped pecvd a-Si:H layers for hetero-structure c-Si solar cells

Stefaan De Wolf*, Michio Kondo

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

6 Scopus citations

Abstract

Hetero-structures, such as the crystalline silicon (c-Si) / doped plasma-enhanced chemical vapor deposited (PECVD) amorphous silicon (a-Si:H) structure, are an elegant way to avoid recombination losses at the electrical contacts of high conversion efficiency photovoltaic devices. To find a good compromise between limited charge carrier recombination at the surface and a limited resistivity of the contact, sandwich structures such as c-Si (p or n) / a-Si:H (i) / a-Si:H (p+ or n+) have been proposed in the past. In this paper we report on the surface passivation properties of such stacked doped a-Si:H layers, with a total thickness of only a few nm. Whereas subsequent deposition of a-Si:H (n+) films on thin a-Si:H (i) layers improves the surface passivation quality, a clear passivation degradation is seen when a-Si:H (i) layers are covered by a-Si:H (p+) films. The observed trends are irrespective of the wafer-type. This article discusses possible causes for these phenomena and a model for the recombination-mechanism is proposed.

Original languageEnglish (US)
Title of host publicationConference Record of the 2006 IEEE 4th World Conference on Photovoltaic Energy Conversion, WCPEC-4
Pages1469-1472
Number of pages4
DOIs
StatePublished - Dec 1 2007
Event2006 IEEE 4th World Conference on Photovoltaic Energy Conversion, WCPEC-4 - Waikoloa, HI, United States
Duration: May 7 2006May 12 2006

Publication series

NameConference Record of the 2006 IEEE 4th World Conference on Photovoltaic Energy Conversion, WCPEC-4
Volume2

Other

Other2006 IEEE 4th World Conference on Photovoltaic Energy Conversion, WCPEC-4
CountryUnited States
CityWaikoloa, HI
Period05/7/0605/12/06

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

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