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|dc.title||Reversible phase transformation on Ge(111) surface by potential|
|dc.identifier.citation||Ye, J.H., Pan, J.S., Liu, J.G., Li, S.F.Y. (1999-09). Reversible phase transformation on Ge(111) surface by potential. Electrochemical and Solid-State Letters 2 (9) : 448-451. ScholarBank@NUS Repository. https://doi.org/10.1149/1.1390867|
|dc.description.abstract||Reversible phase transformation on atomically flat Ge(111) induced by potential in 40% NH4F solution has been observed with in situ scanning tunneling microscope. The abrupt change in Ge surface morphology as a function of the potential is attributed to the phase transformation, where small terraces are converted into large terraces as the potential is changed from -1.32 to -0.98 V. Cyclic voltammograms show that the charge under the cathodic peak is almost the same as that under the anodic peak (4.2×10-4 C/cm2). Combined with ex situ X-ray photoelectron spectroscopy and secondary-ion mass spectroscopy results, we conclude that Ge(111) surface is terminated by a monolayer hydroxide or hydride depending on the applied potential. The formation of hydroxide-terminated Ge(111) is likely to occur at -0.98 V, far away from the anodic peak in the cyclic voltammogram. This fact suggests that the reversible phase transformation between monolayer hydrogen- and hydroxyl-capped Ge(111) surface is induced by potential. An atomically flat Ge(111) surface prepared with wet cleaning provides an attractive substrate for epitaxial growth of compound semiconductors.|
|dc.contributor.department||INST OF MATERIALS RESEARCH & ENGINEERING|
|dc.description.sourcetitle||Electrochemical and Solid-State Letters|
|Appears in Collections:||Staff Publications|
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