Formation of thin-film crystalline silicon on glass observed by in-situ XRD

JM Westra, V Vavrunkova, P Sutta, RACMM van Swaaij, M Zeman

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

23 Citations (Scopus)

Abstract

Thin-film poly-crystalline silicon (poly c-Si) on glass obtained by crystallization of an amorphous silicon (a-Si) film is a promising material for low cost, high efficiency solar cells. Our approach to obtain this material is to crystallize a-Si films on glass by solid phase crystallization (SPC). As the grain size of SPC poly c-Si films will be smaller than that of multi-crystalline wafers, lower solar cell efficiencies are expected for this technology. Despite the smaller grain size, a 2-micron-thick polycrystalline silicon solar cell with light trapping was shown to have a conversion efficiency of more than 10% [1]. Obtainable efficiencies up to 15% are expected for solar cells made using SPC of a-Si:H films. Expanding thermal plasma chemical vapor deposition (ETP-CVD) was used to prepare hydrogenated a-Si films; this technique is chosen because the deposition rates are much higher than with plasma enhanced CVD. A-Si:H films with different hydrogen contents were annealed using temperatures ranging from 500 °C to 700 °C. The evaluation of the films after annealing treatments revealed that the hydrogen content and bonding configuration did not influence the structural properties of the crystallized films significantly. The average crystallite size in the fully crystallized films was between 100 and 150 nm. Full crystallization of 1 micrometer thick films was achieved within 20 minutes for annealing at 625 °C and 650 °C. During annealing at 600 °C crystallization is much slower, and no crystallization is observed at 500 °C. The relation between the annealing temperature and the rate with which the films are fully crystallized is of great importance to develop a solar cell technology, to limit the thermal budget and processing time.
Original languageEnglish
Title of host publicationProceedings of Inorganic and Nanostructured Photovoltaics (E-MRS 2009 Symposium B)
EditorsG Beaucarne, G Conibeer, E Mellikov, R Schropp, M Topic
Place of PublicationAmsterdam, The Netherlands
PublisherElsevier
Pages235-241
Number of pages7
DOIs
Publication statusPublished - 2010
EventE-MRS 2009 Spring Meeting, Strasbourg, France - Amsterdam, The Netherlands
Duration: 8 Jun 200912 Jun 2009

Publication series

Name
PublisherElsevier Ltd
NameEnergy Procedia
Volume2
ISSN (Print)1876-6102

Conference

ConferenceE-MRS 2009 Spring Meeting, Strasbourg, France
Period8/06/0912/06/09

Keywords

  • conference contrib. refereed
  • Conf.proc. > 3 pag

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