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|Title: ||Optical monitoring of nonequilibrium carrier diffusion in single crystalline CVD and HPHT diamonds under high optical excitation|
|Authors: ||Scajev, P.|
|Issue Date: ||2011|
|Citation: ||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.
|ISI #: ||000291060300009|
|Type: ||Journal Contribution|
|Validation: ||ecoom, 2012|
|Appears in Collections: ||Research publications|
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