Preferential growth of Si films on 6H-SiC(0 0 0 1) C-face

Si/SiC heterojunctions are successfully prepared on 6H-SiC(0 0 0 1) C-face by low-pressure chemical vapor deposition. X-ray diffraction and scanning electron microscopy are used to investigate the growth orientation and the surface morphology of the Si films. The results indicate that preferential growth orientation of 〈1 1 1〉 can be achieved in a temperature range of 825–1000 °C. Within the temperature range, grain size of the Si films becomes larger as temperature increases. Molecular dynamics calculation results indicate that the interface formation energy of the Si(1 1 1)/6H-SiC(0 0 0 1) C-face is smaller than that of Si(1 1 0)/6H-SiC(0 0 0 1) C-face. This is the reason why the Si films prefer to grow on the (1 1 1) crystal plane. Highlights

► Si films are prepared on SiC C-face by low-pressure chemical vapor deposition.

► Preferential growth orientation of 〈1 1 1〉 can be achieved in a temperature range.

► Si films grown on SiC C-face show a better crystal quality than that of Si-face.

► Si/SiC structures are analyzed by GULP.

► Each of Si/SiC C-face interface energy are calculated.

Source:Applied Surface Science

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