
αhν=B(hν-Eg)m
其中 α 为摩尔吸收系数,h 为普朗克常数, ν 为入射光子频率, B 为比例常数, Eg为半导体材料的光学带隙, m 的值与半导体材料以及跃迁类型相关:
( 1) 当 m=1/2 时,对应直接带隙半导体允许的偶极跃迁;
( 2) 当 m=3/2 时,对应直接带隙半导体禁戒的偶极跃迁;
( 3) 当 m=2 时,对应间接带隙半导体允许的跃迁;
( 4) 当 m=3 时,对应间接带隙半导体禁戒的跃迁。
计算失败后,给出的错误信息是2014/09/03@15:07:31 - GaP CASTEP GeomOpt ERROR CASTEP terminated with unknown error status.2014/09/03@15:07:33 - GaP CASTEP GeomOpt ERROR Error on Job Complete. Failed to import document from C:\Users\pc\Documents\Materials Studio Projects\2014090301 Files\Documents\GaP CASTEP GeomOpt\GaP.xsd. - binary file with castep results not present.
2014/09/03@15:07:33 - GaP CASTEP GeomOpt ERROR Files not removed from server due to previous errors.
2014/09/03@15:07:33 - GaP CASTEP GeomOpt WARN As instructed, files have been left on remote server, these may need to be manually archived.
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