Surface states and photo-induced charge transfer on oxygen-terminated chemical vapor deposition diamond

0360234 - ÚJF 2012 RIV US eng J - Journal Article
Deferme, W. - Macková, Anna - Haenen, K. - Nesladek, M.
Surface states and photo-induced charge transfer on oxygen-terminated chemical vapor deposition diamond.
Journal of Applied Physics. Roč. 109, č. 6 (2011), 063701/1-063701/3. ISSN 0021-8979. E-ISSN 1089-7550
Institutional research plan: CEZ:AV0Z10480505
Keywords : CRYSTAL CVD-DIAMOND * TRANSPORT * MOBILITY
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 2.168, year: 2011

Time-of-Flight (ToF) experiments were carried out to study the electrical transport and charge trapping properties of oxidized freestanding single crystalline (100) CVD diamond crystals. It is shown that the diamond surface and properties of the electrical contacts are of extreme importance, influencing measured charge carrier mobility values. While sputtered Al contacts yield textbook ToF spectra and electron mobilities mu(e) exceeding 1860 cm(2)/Vs, thermally deposited contacts suffer from enhanced trapping. We propose a model in which the observed polarization effects can be explained by charge transfer to oxygen-related surface states, which interact with surface adsorbates, according to the well-known transfer-doping model.
Permanent Link: http://hdl.handle.net/11104/0197831