AVS 56th International Symposium & Exhibition
    Surface Science Thursday Sessions
       Session SS-ThP

Paper SS-ThP1
Ordered 2-D Structure of Si(337)-4×1 Induced by C Incorporation into Si(5 5 12)-2×1

Thursday, November 12, 2009, 6:00 pm, Room Hall 3

Session: Surface Science Poster Session
Presenter: H. Kim, Chonbuk National University, Republic of Korea
Authors: H. Kim, Chonbuk National University, Republic of Korea
O. Dugerjav, Chonbuk National University, Republic of Korea
G. Duvjir, Chonbuk National University, Republic of Korea
H. Li, Chonbuk National University, Republic of Korea
J.M. Seo, Chonbuk National University, Republic of Korea
Correspondent: Click to Email
Using STM, it has been found that Si(5 5 12)-2×1 composed of tetramer (T) / dimer-adatom (D-A) rows and π-bonded (π) / honeycomb (H) chains [Surf. Sci. 601, 1831 (2007] is transformed irreversibly to an ordered (337)-4×1 terrace with (113) facets through adsorbing C2H2 at 650℃ followed by post-annealing at 750℃. The transformation from (5 5 12) to (337) starts from a T row and a π chain in the (5 5 12) surface, and simultaneously the rest part of (5 5 12) converts to T rows and π chains, which will be transformed to (337). By Si 2p and C 1s core-level photoemission studies using synchrotron radiation, it has been confirmed that such an irreversible structural transformation is due to subsurface C atoms. If the (337) terrace is only composed of T rows and π chains with a 2× periodicity, the compressive stress exists so that the (337) terrace becomes unstable. However, subsurface C atoms release this compressive stress through breaking 1-D structures and change to a stable surface composed of 4×1 dot structures. The detailed atomic structures of the 4×1 surface and the steps of transformation will be presented.