Band diagram for chemical vapor deposition diamond surface conductive layer: presence of downward band bending due to shallow acceptors
SCIE
SCOPUS
- Title
- Band diagram for chemical vapor deposition diamond surface conductive layer: presence of downward band bending due to shallow acceptors
- Authors
- Kono, S; Saito, T; Kang, SH; Jung, WY; Kim, BY; Kawata, H; Goto, T; Kakefuda, Y; Yeom, HW
- Date Issued
- 2010-07-15
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- The properties of surface conductivity (SC) of impurity-non-doped CVD diamond (001) samples were studied by various methods of sheet-resistance (R-s) measurement, Hall-effect measurement, XPS, UPS, SES, SR-PES, PEEM and 1D band simulation taking into account special emphases on deriving the information about the surface band diagram (SBD). The R-s values in UHV conditions were determined after no-annealing or 200 similar to 300 degrees C annealing in UHV. C 1 s XPS profiles were measured in detail in bulk-sensitive and surface-sensitive modes of photoelectron detection. The energy positions of valence band top (E-v) relative to the Fermi level (E-F) in UHV conditions after no-annealing or 200 similar to 300 degrees C annealing in UHV were determined. One of the samples was subjected to SR-PES, PEEM measurements. The SBDs were simulated by a band simulator from the determined R-s and E-v - E-F values for three samples based on the two models of surface conductivity, namely, so-called surface transfer doping (STD) model and downward band bending with shallow acceptor (DBB/SA) model. For the DBB/SA model, there appeared downward bends of SBDs toward the surface at a depth range of similar to 1 nm. C 1 s XPS profiles were then simulated from the simulated SBDs. Comparison of simulated C 1 s XPS profiles to the experimental ones showed that DBB/SA model reproduces the C 1 s XPS profiles properly. PEEM observation of a sample can be explained by the SBD based on the DBB/SA model. Mechanism of SC of CVD diamonds is discussed on the basis of these findings. It is suggested that the STD model combined with SBD of DBB/SA model explains the surface conductivity change due to environmental changes in actual cases of CVD diamond SC with the presence of surface E-F controlling defects. (C) 2010 Elsevier B.V. All rights reserved.
- Keywords
- Chemical vapor deposition; Diamond; (100) surface; Surface conductivity; Energy band diagram; Electron spectroscopy; Photoemission electron microscopy; PHOTOELECTRON-SPECTROSCOPY; ELECTRONIC-PROPERTIES; CARBON FILMS; GROWTH; SPECTRA; STATES; SP(3); XPS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/25002
- DOI
- 10.1016/J.SUSC.2010.03.031
- ISSN
- 0039-6028
- Article Type
- Article
- Citation
- SURFACE SCIENCE, vol. 604, no. 13-14, page. 1148 - 1165, 2010-07-15
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