TY - JOUR
T1 - Atomic surface characterisation and modification of the layered compounds Bi2Se3, Bi1.9Sb0.1Se3 and Bi1.6Sb0.4Se3
AU - Antoranz Contera, S.
AU - Yoshinobu, T.
AU - Iwasaki, H.
AU - Bastl, Z.
AU - Losták, P.
N1 - Funding Information:
This work was supported by the Centre of Excellence Programme (09CE2005) from the Ministry of Education, Science, Sports and Culture of Japan. S. Antoranz Contera has been supported by a fellowship of the European Union Science and Technology Fellowship Programe in Japan 2000/2001.
PY - 2001
Y1 - 2001
N2 - In this work, we show atomic STM images of the layered compound Bi2Se3. We study the effect in the surface of the substitution of 5% and 20% of the Bi atoms for Sb in Bi1.9Sb0.1Se3 and Bi1.6Sb0.4Se3. The images of the three samples show similar trigonal structures corresponding probably to the van der Waals Se atoms. The distance measured between surface atoms in Bi2Se3 is 4.04Å, in Bi1.9Sb0.1Se3 is 4.16Å and in Bi1.6Sb0.4Se3 is 4.26Å. In Bi1.6Sb0.4Se3 some atomic sites appear brighter than others. The effect is accentuated at higher tunnelling currents and is not observed in the other compounds. Nanoscopic range depressions on the sample might be related to the skeletal crystal structure since the images show atomic corrugations that align slightly in one direction. We explain the results as the effects of the interactions between tip and sample, and discuss two interpretations: on the one hand, localised depression of the individual atomic sites, and on the other the possible elevation of the atoms of the surface due to a phase transition of the compounds induced by STM.
AB - In this work, we show atomic STM images of the layered compound Bi2Se3. We study the effect in the surface of the substitution of 5% and 20% of the Bi atoms for Sb in Bi1.9Sb0.1Se3 and Bi1.6Sb0.4Se3. The images of the three samples show similar trigonal structures corresponding probably to the van der Waals Se atoms. The distance measured between surface atoms in Bi2Se3 is 4.04Å, in Bi1.9Sb0.1Se3 is 4.16Å and in Bi1.6Sb0.4Se3 is 4.26Å. In Bi1.6Sb0.4Se3 some atomic sites appear brighter than others. The effect is accentuated at higher tunnelling currents and is not observed in the other compounds. Nanoscopic range depressions on the sample might be related to the skeletal crystal structure since the images show atomic corrugations that align slightly in one direction. We explain the results as the effects of the interactions between tip and sample, and discuss two interpretations: on the one hand, localised depression of the individual atomic sites, and on the other the possible elevation of the atoms of the surface due to a phase transition of the compounds induced by STM.
KW - Atomic surface characterisation
KW - BiSe
KW - Layered materials
KW - Scanning tunnelling microscopy
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U2 - 10.1016/S0304-3991(00)00088-7
DO - 10.1016/S0304-3991(00)00088-7
M3 - Article
C2 - 11215634
AN - SCOPUS:0035142372
VL - 86
SP - 55
EP - 61
JO - Ultramicroscopy
JF - Ultramicroscopy
SN - 0304-3991
IS - 1-2
ER -