TY - JOUR
T1 - Column-by-column observation of dislocation motion in CdTe
T2 - Dynamic scanning transmission electron microscopy
AU - Li, Chen
AU - Zhang, Yu Yang
AU - Pennycook, Timothy J.
AU - Wu, Yelong
AU - Lupini, Andrew R.
AU - Paudel, Naba
AU - Pantelides, Sokrates T.
AU - Yan, Yanfa
AU - Pennycook, Stephen J.
N1 - Publisher Copyright:
© 2016 Author(s).
PY - 2016/10/3
Y1 - 2016/10/3
N2 - The dynamics of partial dislocations in CdTe have been observed at the atomic scale using aberration-corrected scanning transmission electron microscopy (STEM), allowing the mobility of different dislocations to be directly compared: Cd-core Shockley partial dislocations are more mobile than Te-core partials, and dislocation cores with unpaired columns have higher mobility than those without unpaired columns. The dynamic imaging also provides insight into the process by which the dislocations glide. Dislocations with dangling bonds on unpaired columns are found to be more mobile because the dangling bonds mediate the bond exchanges required for the dislocations to move. Furthermore, a screw dislocation has been resolved to dissociate into a Shockley partial-dislocation pair along two different directions, revealing a way for the screw dislocation to glide in the material. The results show that dynamic STEM imaging has the potential to uncover the details of dislocation motion not easily accessible by other means.
AB - The dynamics of partial dislocations in CdTe have been observed at the atomic scale using aberration-corrected scanning transmission electron microscopy (STEM), allowing the mobility of different dislocations to be directly compared: Cd-core Shockley partial dislocations are more mobile than Te-core partials, and dislocation cores with unpaired columns have higher mobility than those without unpaired columns. The dynamic imaging also provides insight into the process by which the dislocations glide. Dislocations with dangling bonds on unpaired columns are found to be more mobile because the dangling bonds mediate the bond exchanges required for the dislocations to move. Furthermore, a screw dislocation has been resolved to dissociate into a Shockley partial-dislocation pair along two different directions, revealing a way for the screw dislocation to glide in the material. The results show that dynamic STEM imaging has the potential to uncover the details of dislocation motion not easily accessible by other means.
UR - https://www.scopus.com/pages/publications/84990047920
U2 - 10.1063/1.4963765
DO - 10.1063/1.4963765
M3 - 文章
AN - SCOPUS:84990047920
SN - 0003-6951
VL - 109
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 14
M1 - 143107
ER -