The interfacial properties of MgCl(2) thin films grown on Si(111)7 x 7.
Photoelectron spectroscopy with synchrotron radiation and low energy electron diffraction (LEED) were used in order to study the MgCl(2)Si(111) system. At submonolayer coverage of MgCl(2), a new LEED pattern was observed corresponding to a (sqr rt 3 x sqr rt 3)R30 degrees overlayer superimposed on the underlying reconstructed Si(111)7 x 7. The surface species at this stage are mainly molecular MgCl(2) and MgCl(x) (x<2) or MgO(x)Cl(y) attached to the Si substrate through Cl bridges coexisting with monodentate SiCl. The interfacial interaction becomes more pronounced when the submonolayer coverage is obtained by annealing thicker MgCl(2) layers, whereby desorption of molecular MgCl(2) is observed leaving on the nonreconstructed silicon surface an approximately 0.2 ML thick MgCl(x) layer which again forms the (sqr rt 3 x sqr rt 3 )R30 degrees superstructure.
Karakalos
Stavros
S
Department of Chemical Engineering, University of Patras, Rion, Patras, Greece. skarak@chemeng.upatras.gr
Siokou
Angeliki
A
Dracopoulos
Vasileios
V
Sutara
Frantisek
F
Skala
Tomas
T
Skoda
Michal
M
Ladas
Spyros
S
Prince
Kevin
K
Matolin
Vladimir
V
Chab
Vladimir
V