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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/3574

Title: SUBGAP OPTICAL-ABSORPTION IN CVD DIAMOND FILMS DETERMINED FROM PHOTOTHERMAL DEFLECTION SPECTROSCOPY
Authors: NESLADEK, Milos
VANECEK, M
ROSA, J
QUAEYHAEGENS, Carl
STALS, Lambert
Issue Date: 1995
Publisher: ELSEVIER SCIENCE SA LAUSANNE
Citation: DIAMOND AND RELATED MATERIALS, 4(5-6). p. 697-701
Abstract: Photothermal deflection spectroscopy (PDS) was applied for the first time to measure the subgap optical absorption, induced by defects in free-standing diamond films. Compared with the optical transmission measurement, PDS is far more sensitive and even a defect concentration below parts per million level can be identified. Moreover, the elastic light scattering influences the measured data significantly less. The optical absorption measurement shows an optical transition which starts at about 1 eV, independently of the sp(2) content in the film. This level agrees well with the 1 eV activation energy of the dark conductivity. Additionally, an optical transition starting at about 3 eV is observed for white colourless films.
Notes: ACAD SCI CZECH REPUBL,INST PHYS,CR-16000 PRAGUE 06,CZECH REPUBLIC.NESLADEK, M, LIMBURGS UNIV CENTRUM,INST MAT RES,DIV MAT PHYS,UNIV CAMPUS,WETENSCHAPS PK,B-3590 DIEPENBEEK,BELGIUM.
URI: http://hdl.handle.net/1942/3574
DOI: 10.1016/0925-9635(94)05248-4
ISI #: A1995QV43500030
ISSN: 0925-9635
Type: Journal Contribution
Appears in Collections: Research publications

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