Title: Column-by-column observation of dislocation motion in CdTe: Dynamic scanning transmission electron microscopy

Abstract

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. This research was sponsored by the U.S. DOE, Office of Energy Efficiency and Renewable Energy, Foundational Program to Advance Cell Efficiency (F-PACE, DE-FOA-0000492), (CL, YLW, NP, YFY, SJP), the Office of DOE-BES, Materials Science and Engineering Division (ARL), DOE Grant No. DE-FG02-09ER46554 (YYZ, STP), and a user project supported by ORNL'smore » Center for Nanophase Materials Sciences (CNMS), which is also sponsored by DOE-BES. Supercomputer time was provided by the National Center for Supercomputing Applications which is supported by the DOE Office of Science under Contract No. DE-AC02-05CH11231, and the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation Grant No. ACI-1053575. Chen Li [No. 656378] and Timothy Pennycook [No.655760] are currently funded by the European Union's Marie Sklodowska-Curie Grants.« less

Authors:

Li, Chen  ^[1];

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Zhang, Yu-Yang ^[2]; Pennycook, Timothy J. ^[1]; Wu, Yelong ^[3]; Lupini, Andrew R. ^[4]; Paudel, Naba ^[3]; Pantelides, Sokrates T. ^[2]; Yan, Yanfa ^[3]; Pennycook, Stephen J. ^[5]

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+ Show Author Affiliations

1. Univ. of Vienna (Austria)
2. Vanderbilt Univ., Nashville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
3. Univ. of Toledo, OH (United States)
4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
5. National University of Singapore (Singapore)

Publication Date:

Tue Oct 04 00:00:00 EDT 2016

Research Org.:

Vanderbilt Univ., Nashville, TN (United States)

Sponsoring Org.:

USDOE Office of Science (SC)

OSTI Identifier:

1597790

Alternate Identifier(s):

OSTI ID: 1328462

Grant/Contract Number:  

FG02-09ER46554; DOE EERE, F-PACE, FOA-0000492; DOE BES, Materials Science and Engineering Division; DOE user project supported by ORNL's Center for Nanophase Materials Sciences (CNMS), DOE-BES

Resource Type:

Accepted Manuscript

Journal Name:

Applied Physics Letters

Additional Journal Information:

Journal Volume: 109; Journal Issue: 14; Journal ID: ISSN 0003-6951

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE