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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/3425

Title: Origin of characteristic subgap optical absorption in CVD diamond films
Authors: NESLADEK, Milos
MEYKENS, Kristien
STALS, Lambert
Vanecek, M
Rosa, J
Issue Date: 1996
Publisher: AMERICAN PHYSICAL SOC
Citation: PHYSICAL REVIEW B, 54(8). p. 5552-5561
Abstract: Photothermal deflection spectroscopy (PDS) is used to study subgap optical absorption in chemical vapor deposited (CVD) diamond films. The high PDS sensitivity over a broad investigated spectral range enabled the investigation of the main defect structure in CVD diamond upon changing the deposition conditions. All films exhibit a very characteristic shape of the subgap optical absorption in the infrared and visible spectral regions, which scales with the content of amorphous carbon phase in grain boundaries. In best-quality films the character of the fundamental absorption edge is attained and the subgap absorption reduced. For nanocrystalline approaching films, an absorption spectrum resembling closely the one for amorphous carbon (a-C:H) films is observed. Based on these results a mathematical model for the description of the optical absorption coefficient in the subgap region is developed. A numerical deconvolution procedure is applied to fit the experimental data.
Notes: ACAD SCI CZECH REPUBL,INST PHYS,CZ-16200 PRAGUE,CZECH REPUBLIC.Nesladek, M, LIMBURGS UNIV CTR,INST MAT RES,DIV MAT PHYS,WETENSCHAPS PK,B-3590 DIEPENBEEK,BELGIUM.
URI: http://hdl.handle.net/1942/3425
DOI: 10.1103/PhysRevB.54.5552
ISI #: A1996VF92900057
ISSN: 0163-1829
Type: Journal Contribution
Appears in Collections: Research publications

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