Transport properties of hydrogen-terminated nanocrystalline diamond films

0377220 - FZÚ 2013 RIV CH eng J - Článek v odborném periodiku
Hubík, Pavel - Mareš, Jiří J. - Kozak, Halyna - Kromka, Alexander - Rezek, Bohuslav - Krištofik, Jozef - Kindl, Dobroslav
Transport properties of hydrogen-terminated nanocrystalline diamond films.
Diamond and Related Materials. Roč. 24, April (2012), 63-68. ISSN 0925-9635. E-ISSN 1879-0062
Grant CEP: GA AV ČR KAN400100701; GA AV ČR(CZ) IAAX00100902; GA ČR GAP204/10/0212
Výzkumný záměr: CEZ:AV0Z10100521
Klíčová slova: nanocrystalline diamond * hydrogen termination * grain boundaries * Hall effect * transport mechanism
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 1.709, rok: 2012

Hydrogen-terminated nanocrystalline diamond films of different granularity are investigated by van der Pauw measurement of the resistivity and Hall effect depending on the grain size. In agreement with the observation on the hydrogenated diamond single crystals, the measured transport quantities are surface related. The room temperature resistivity strongly increases when the mean grain size at surface varies from about 400 nm down to 40 nm while the Hall concentration is only weakly dependent on the granularity and exhibits values comparable with those found in hydrogenated single crystals. Using a two-dimensional geometrical model, we show that effective resistivity is controlled by the transversal resistance of the grain boundaries. Based on the mobility–concentration relation obtained by the surface adsorbate desorption, microscopic origin of the boundary resistance is discussed.
Trvalý link: http://hdl.handle.net/11104/0209443