Atomic resolution monitoring of cation exchange in CdSe-PbSe heteronanocrystals during epitaxial solid-solid-vapor growth.
Here, we show a novel solid-solid-vapor (SSV) growth mechanism whereby epitaxial growth of heterogeneous semiconductor nanowires takes place by evaporation-induced cation exchange. During heating of PbSe-CdSe nanodumbbells inside a transmission electron microscope (TEM), we observed that PbSe nanocrystals grew epitaxially at the expense of CdSe nanodomains driven by evaporation of Cd. Analysis of atomic-resolution TEM observations and detailed atomistic simulations reveals that the growth process is mediated by vacancies.
Kavli Institute of Nanoscience, Delft University of Technology , Lorentzweg 1, 2628 CJ Delft, The Netherlands.
Anil O
AO
Yalcin
Zhaochuan
Z
Fan
Bart
B
Goris
Wun-Fan
WF
Li
Rik S
RS
Koster
Chang-Ming
CM
Fang
Alfons
A
van Blaaderen
Marianna
M
Casavola
Frans D
FD
Tichelaar
Sara
S
Bals
Gustaaf
G
Van Tendeloo
Thijs J H
TJ
Vlugt
Daniël
D
Vanmaekelbergh
Henny W
HW
Zandbergen
Marijn A
MA
van Huis