期刊
ULTRAMICROSCOPY
卷 134, 期 -, 页码 207-213出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultramic.2013.05.004
关键词
Hctcrostructurcd nanocrystals; Electron beam irradiation; Exit wave reconstruction; Aberration corrected TEM; Phase transition
类别
资金
- U.S. Department of Energy [DE-AC02-05CH11231]
- DOE Early Career Research Program
The atomic structure and interfaces of CdS/Cu2S heterostructured nanorods are investigated with the aberration corrected TEAM 0.5 electron microscope operated at 80 kV and 300 kV applying in line holography and complementary techniques. Cu2S exhibits a low-chalcocite structure in pristine CdS/Cu2S nanorods. Under electron beam irradiation the Cu2S phase transforms into a high-chalcocite phase while the CdS phase maintains its wurtzite structure. Time resolved experiments reveal that Cu+-Cd2+ cation exchange at the CdS/Cu2S interfaces is stimulated by the electron beam and proceeds within an undisturbed and coherent sulfur sob lattice A variation of the electron beam current provides an efficient way to control and exploit such irreversible solid-state chemical processes that provide unique information about system dynamics at the atomic scale. Specifically, we show that the electron beam-induced copper cadmium exchange is site specific and anisotropic. A resulting displacement of the CdS/Cu2S interfaces caused by beam-induced cation interdiffusion equals within a factor of 3-10 previously reported Cu diffusion length measurements in heterostructured CdS/Cu2S thin film solar cells with an activation energy of 0.96 eV. (C) 2013 Elsevier B.V. All rights reserved
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