Structural and Electronic Properties of Barium Silicide on Si(100)
Structural and Electronic Properties of Barium Silicide on Si(100)
复制标题
Si(100)上硅化钡的结构和电子性质
DOI:
10.1143/jjap.41.4965
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发表时间:
2002
影响因子:
1.5
通讯作者:
K. Ueda
中科院分区:
文献类型:
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作者:
K. Ojima;M. Yoshimura;K. Ueda
Barium silicides formed on the Si(100) surface have been investigated by scanning tunneling microscopy/spectroscopy (STM/STS). The structure of the silicide surface depends on the preparation procedure; three kinds of silicide phases coexist on the surface when 2 monolayers (MLs) of Ba are deposited on Si(100) at the specimen temperature of 850 K, while two of the three phases appear when 2 MLs of Ba are deposited on Si(100) at room temperature, followed by annealing at 850 K. The STS result indicates that all the phases show semiconducting behavior with a band gap of ∼ 1.3 eV and that one of the three phases has local density of states (LDOS) at 2.5 eV below the Fermi energy, which coincides with the reported results of metastable de-excitation spectroscopy (MDS) and ultraviolet photoelectron spectroscopy (UPS).
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