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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/33450

Title: Highest optical gap tetrahedral amorphous carbon
Authors: K.B.K. Teo;A.C. Ferrari;G. Fanchini;S.E. Rodil;J. Yuan;J.T.H. Tsai;E. Laurenti;A. Tagliaferro;J. Robertson;W.I. Milne
Contributors: 國立臺灣海洋大學:光電科學研究所
Keywords: Diamond-like carbon;Optical properties;Electron spin resonance;Defects
Date: 2002-03
Issue Date: 2013-04-01T06:51:59Z
Publisher: Diamond and Related Materials
Abstract: Abstract:The deposition and characterisation of tetrahedral amorphous carbon (ta-C) with an E04 optical gap of 3.5 eV and Tauc gap of 3 eV is presented. This is the highest optical gap reported in literature for ta-C and was directly measured using photothermal deflection spectroscopy (PDS) and UV-Vis spectrophotometry. Independent PDS, UV-Vis and electron energy loss spectroscopy (EELS) measurements confirmed the high gap. A large Urbach slope of 600 meV was measured, which indicated that there are many tail states. Electron spin resonance (ESR) measurements confirmed that this material has a high spin density of 7.5×1020 spins/cm3. Post-deposition vacuum annealing of the samples to 500 °C resulted in a small increase of the optical gap, E04∼3.6 eV, and a decrease of the defects to 2.7×1020 spins/cm3. Post-deposition annealing at this temperature did not significantly change the sp3 fraction, but caused a 2–3 order of magnitude increase of the conductivity and a significant reduction of the stress. Thus, this is the first demonstration that we can engineer the defects in ta-C by increasing the electron delocalisation whilst maintaining the high sp3 and optical gap of the material.
Relation: 11(3-6), pp.1086–1090
URI: http://ntour.ntou.edu.tw/handle/987654321/33450
Appears in Collections:[光電科學研究所] 期刊論文

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