Figure 2

(a) The HRTEM image at the GeSn/Ge interface of sample B viewed from \([\bar{1}10]\) direction. The mixed type 60° dislocations dominate at the interface due to the low activation energy. The inset shows FFT pattern with different planes marked. (b1) Zoomed-in image of area A shows atomic core structure of 60° dislocation. Burger circuit of 60° dislocation was drawn, identifying its projected burger vector is \(\frac{a\,}{4}[112]\) in \((\bar{1}10)\,\)plane. The inverse FFT images were obtained by masking (b2) \(\{(111)(\bar{1}\bar{1}\bar{1})\}\,\)and (b3) \(\{(11\bar{1})(\bar{1}\bar{1}1)\}\) planes in FFT, showing the extra (111) plane. (c1) Zoomed-in image of area B indicates core structure of Lomer dislocation. Burger circuit was drawn to identify burger vector\(\,\,\frac{a\,}{2}[110]\,\)in (001) plane. Inverse FFT images of Lomer dislocation by masking (c2) \(\{(111)(\bar{1}\bar{1}\bar{1})\}\,\)and (c3) \(\{(11\bar{1})(\bar{1}\bar{1}1)\}\) planes in FFT were also shown.