Picosecond decay of photoinduced absorption in undoped amorphous and polycrystalline silicon thin films

M. Kubinyi, A. Grofcsik, W. J. Jones, T. E. Dyer, J. M. Marshall, A. R. Hepburn

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In this work we discuss picosecond photoinduced absorption (PA) decay curves obtained for amorphous and polycrystalline (furnace crystallised and laser crystallised) silicon thin films. The PA temporal decay curves are recorded using a fast modulation "pump and probe" technique, the pump and probe sources being two dye lasers driven synchronously by a mode-locked argon-ion laser. In order to have comparable decay characteristics, the PA curves have been transformed to Δα (change of the absorption coefficient) curves and normalised to constant charge-carrier densities. The data are found to be very sensitively dependent on the structural properties of the films investigated. In order to explain the phenomena observed we propose a tentative model whereby recombination occurs at the grain boundaries and is rate-limited by carrier diffusion from the crystallites.

Original languageEnglish
Pages (from-to)99-104
Number of pages6
JournalThin Solid Films
Volume263
Issue number1
DOIs
Publication statusPublished - Jul 1 1995

Fingerprint

Amorphous silicon
Polysilicon
amorphous silicon
Pumps
Thin films
Dye lasers
Lasers
Argon
silicon
decay
Silicon
curves
thin films
Laser modes
Charge carriers
Crystallites
Carrier concentration
Structural properties
Grain boundaries
Furnaces

Keywords

  • Optical properties
  • Photoinduced absorption
  • Relaxation
  • Silicon

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces
  • Condensed Matter Physics

Cite this

Picosecond decay of photoinduced absorption in undoped amorphous and polycrystalline silicon thin films. / Kubinyi, M.; Grofcsik, A.; Jones, W. J.; Dyer, T. E.; Marshall, J. M.; Hepburn, A. R.

In: Thin Solid Films, Vol. 263, No. 1, 01.07.1995, p. 99-104.

Research output: Contribution to journalArticle

Kubinyi, M. ; Grofcsik, A. ; Jones, W. J. ; Dyer, T. E. ; Marshall, J. M. ; Hepburn, A. R. / Picosecond decay of photoinduced absorption in undoped amorphous and polycrystalline silicon thin films. In: Thin Solid Films. 1995 ; Vol. 263, No. 1. pp. 99-104.
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