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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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