Density of states and band structure of wurtzite ZnO are calculated by the CASTEP program based on density functional theory and plane-wave pseudopotential method. The calculations are carried out in axial and unaxial strains, respectively. The results of density of states in different strains show that the bottom of the conduction band is always dominated by Zn 4s, and the top of valence band is always dominated by O 2p. The variation of the band gap calculated from band structure is also discussed. In addition, p-d repulsion is used in investigating the variation of the top of the valence band in different strains and the results can be verified by electron density difference.
The AMPS-ID program is used to investigate optical and electrical properties of the solar cell of a-SiC:H/a-Si1-xGex:H/a-Si:H thin films. The short circuit current density, open circuit voltage, fill factor and conversion efficiency of the solar cell are investigated. For x=0.1, the conversion efficiency of the solar cell achieve maximum 9.19 % at the a-Si1-xGex:H thickness of 340 nm.
The access strategy and method of control channel in WMN is an important research project. In this paper, description of access strategy and the method on distributed control channel in WMN based on TDMA are carried out, the coordination mechanism of multiple channels and allocation algorithm of controlling time slot to make the access of control channel fast and fair are proposed. Finally, the paper formulates protocol specification of control channel access, being appropriate for large-scale network, and discusses its application in the maintenance of network topology, route discovery and the establishment of QoS request.
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