Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/12023
Title: Optical monitoring of nonequilibrium carrier diffusion in single crystalline CVD and HPHT diamonds under high optical excitation
Authors: Scajev, P.
Malinauskas, T.
Lubys, L.
Ivakin, E.
NESLADEK, Milos 
HAENEN, Ken 
Jarasiunas, K.
Issue Date: 2011
Publisher: WILEY-BLACKWELL
Source: PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS, 5(5-6). p. 193-195
Abstract: We report on a novel approach for the contactless, all-optical study of ambipolar carrier diffusion in single-crystalline diamond layers. Using interband two-photon and single photon absorption (at 351 nm and 213 nm), we created a spatially-modulated free-carrier light-induced transient grating and monitored the in-plane carrier diffusion in a wide range of injected carrier densities (1015 cm(-3) to 1018 cm(-3)) and temperatures (80 K to 800 K). A drastic decrease of the ambipolar diffusion coefficient from similar to 50 cm(2)/s at low injections to 6-10 cm(2)/s at high ones was observed at room temperature and even stronger at lower temperatures. The modelling based on bandgap renormalization and electron-hole scattering provided a fit to the injection-dependent diffusivity. The determined low-injection ambipolar mobility data for CVD layer were found in a good agreement with electrical time-of-flight measurements. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Notes: [Scajev, P.; Malinauskas, T.; Lubys, L.; Jarasiunas, K.] Vilnius Univ, Inst Appl Res, LT-10222 Vilnius, Lithuania. [Ivakin, E.] Acad Sci Belarus, Inst Phys, Minsk 220072, Byelarus. [Nesladek, M.; Haenen, K.] Hasselt Univ, Inst Mat Res IMO, B-3590 Diepenbeek, Belgium. [Nesladek, M.; Haenen, K.] IMEC Vzw, IMOMEC, B-3590 Diepenbeek, Belgium. patrik.scajev@ff.vu.lt
Keywords: diamond; band-gap renormalisation; electron-hole scattering; carrier diffusion; light-induced transient grating;diamond; band-gap renormalisation; electron-hole scattering; carrier diffusion; light-induced transient grating
Document URI: http://hdl.handle.net/1942/12023
ISSN: 1862-6254
e-ISSN: 1862-6270
DOI: 10.1002/pssr.201105186
ISI #: 000291060300009
Category: A1
Type: Journal Contribution
Validations: ecoom 2012
Appears in Collections:Research publications

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