Nov 5, 2015

Atomic-scale characterization of Si(110)/6H-SiC(0001) heterostructure by HRTEM


Si/SiC heterojunction was employed to realize non-UV light operation of SiC devices.
Si films of preferred orientation have been prepared on 6H-SiC (0001) successfully.
HRTEM results indicate that Si film has epitaxial connection with the 6H-SiC substrate.
The atomic-structure of Si(110)/SiC(0001) interface is defined by HRTEM.
The misfit dislocation density at Si(110)/SiC(0001) interface is calculated.


The atomic structure of Si(110)/SiC(0001) heterojunctions prepared on 6H-SiC(0001) was characterized by transmission electron microscopy and X-ray diffraction. An FCC-on-HCP parallel epitaxy is achieved for the Si(110)/SiC(0001) heterostructure with a growth temperature of 1050 °C and the in-plane orientation relationship is Si[1-10]//6H-SiC[11-20]. The pure edge misfit dislocations with a Burgers vector of View the MathML source<11-20>SiCparallel to the interface are observed to accommodate the extreme lattice mismatch. Along the in-plane orientation Si[1-10]SiC[11-20], the Si/6H-SiC interface has a 4:5 Si-to-SiC matching mode with a residual lattice-mismatch of 0.26%. The misfit dislocation density at the Si/SiC interface is calculated as 1.217×1014 cm−2.


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