Browsing by Author "Ferng, SS"

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Atomistic view of the recombinative desorption of H(2) from H/Si(100)
(2005-05-20)
Ferng, SS
;
Lin, CT
;
Yang, KM
;
Lin, DS
;
Chiang, TC
Scanning tunneling microscopy is employed to investigate the recombinative desorption of H(2) from hydrogenated Si(100) surfaces consisting of dihydride (SiH(2)) and monohydride (SiH) surface species organized in (1x1), (3x1), and (2x1) configurations. The results show that desorption from dihydrides involves a pair of neighboring dihydrides linked along the tetrahedral bond direction. Dihydrides in (3x1) domains are separated in the same direction by monohydrides, and desorption from a pair is geometrically impossible. The same desorption mechanism nevertheless applies via first a position switching of dihydrides with neighboring monohydrides.
Atomistic view of the recombinative desorption of H-2 from H/Si(100)
(2005-05-20)
Ferng, SS
;
Lin, CT
;
Yang, KM
;
Lin, DS
;
Chiang, TC
Scanning tunneling microscopy is employed to investigate the recombinative desorption of H-2 from hydrogenated Si(100) surfaces consisting of dihydride (SiH2) and monohydride (SiH) surface species organized in (1x1), (3x1), and (2x1) configurations. The results show that desorption from dihydrides involves a pair of neighboring dihydrides linked along the tetrahedral bond direction. Dihydrides in (3x1) domains are separated in the same direction by monohydrides, and desorption from a pair is geometrically impossible. The same desorption mechanism nevertheless applies via first a position switching of dihydrides with neighboring monohydrides.
Evolution of two-dimensional structure phase transitions (3 x 1) -> (2 x 1) and (1 x 1) -> (2 x 1) on hydrogen-terminated Si(100) surface
(2006-03-01)
Ferng, SS
;
Lin, CT
;
Yang, KM
;
Hsieh, MF
;
Lin, DS
On the Si(100) surface, monohydride dimers (H-Si-Si-H or M-M) and dihydride (H-Si-H or D) species can form an ordered mixture with (3 x 1), (1 x 1) and (2 x 1) phases. Thermal annealing at elevated temperatures causes both the (3 x 1) and (1 x 1) domains to transform to the (2 x 1) monohydride phase. We utilize scanning tunneling microscopy to observe these two-dimensional structure phase transitions on the atomic scale. The results show that the coverage of the (3 x 1) and (1 x 1) domains decays linearly with a common half-life time of similar to 9.8 It at 570 K. In good agreement with a previous report, this finding suggests that the two different transitions are governed by the same reaction mechanism, i.e., the dihydride-pair recombination mechanism.