Controls of surface structures, their domain structures, and surface electrical conduction

表面结构、域结构和表面电传导的控制

• 批准号: 07455018
• 负责人: HASAGAWA Shuji
• 金额: $ 4.74万
• 依托单位: The University Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455018/
• 关键词: silicon; surface superstructures; surface electrical conduction; scanning tunneling microscopy; deposition; metal; semiconductor interface; two-dimensional gas phase; domains

(1)In the last year, we found that Ag atoms deposited on the Si(111)-ROO<3>xROO<3>-Ag surface at room temperature formed a two-dimensional ges phase which remarkably enhanced the surface electrical conductance. In this year, we have succeeded to clarify the mechanism. Ag adatoms donates electrons into a surface-state band of the substrate surface, resulting in the enhancement of conductivity through the surface-state band. On the other hand, the carrier concentration in the surface space-charge layr have found to be decreased. This is the first time in the world to experimentally confirm the conductivity enhancement due to carrier doping by adsorbates into a surface-state band.(2)We have already found that Au deposition on the Si(111)-ROO<3>xROO<3>-Ag surface induces a ROO<21>xROO<21> surface superstructure which exhibits an extremely high electrical conductance. In this year, we have investigated the correlation between the structure and electronic transport property based on scanning tunneling microscopy and photoemission spectroscopy measurements. We have then found that a highly dispersive surface-state band is newly formed, and the carriers therein makes the conductivity high. This is the first time in the world to experimentally confirm the electrical conduction through a surface-state band.

(1)去年，我们发现室温下Ag原子沉积在Si(111)-ROO 3 xROO 3 -Ag表面形成二维ges相，显着提高了表面电导率。今年，我们成功地厘清了机制。银吸附原子将电子贡献到基底表面的表面态带中，导致通过表面态带的电导率增强。另一方面，发现表面空间电荷层中的载流子浓度降低。这是世界上首次通过实验证实吸附剂掺杂到表面能带中导致载流子掺杂而增强电导率。(2)我们已经发现Si(111)-ROO<3>xROO<3>-Ag表面上的Au沉积诱导了ROO<21>xROO<21>表面超结构，该超结构表现出极高的电导率。今年，我们基于扫描隧道显微镜和光电子能谱测量研究了结构与电子传输特性之间的相关性。然后我们发现新形成了高色散的表面能带，其中的载流子使得电导率很高。这是世界上首次通过表面态带实验证实导电。

项目成果

X.Tong,S.Hasegawa,S.Ino: "Structures and electrical conductance of the Si(111)-(√3×√3)Ag Surface with additional Ag adsorption at low temperatures" Physical Review. B55. 1310-1313 (1997)

X.Tong、S.Hasekawa、S.Ino：“低温下附加银吸附的 Si(111)-(√3×√3)Ag 表面的结构和电导”物理评论 B55。 1997）

Y.NakaJima,C.Voges,T.Nagao,S.Hasegawa: "Criticecl scattering at the order-disorder phase transition of √3×√3R30°-Au on Si(111):A phase transition with particle exchange" Physical Review. B55 No.7(印刷中). (1997)

Y.NakaJima、C.Voges、T.Nagao、S.Hasekawa：“Si(111) 上 √3×√3R30°-Au 的有序-无序相变的临界散射：具有粒子交换的相变”物理评论.B55 No.7（印刷中）（1997）。

Z.H.Zhang,S.Hasegawa S.Ino: "Reconstruction and growth of Ag on the Si(111)-√<3>×√<3>-Ag surface at room temperature" Physical Review B. 52. 10760-10763 (1995)

Z.H.Zhang、S.Hasekawa S.Ino：“室温下 Si(111)-√<3>×√<3>-Ag 表面上银的重建和生长” 物理评论 B. 52. 10760-10763 (1995) ）

C.-S.Jiang,S.Hasegawa,S.Ino: "Electrical conduction through the Surface-state band of the Si(111)-(√21×√21)-(Ag+Au) structure" Surface Science. 376(印刷中). (1997)

C.-S.Jiang、S.Hasekawa、S.Ino：“通过 Si(111)-(√21×√21)-(Ag+Au) 结构的表面态带的电传导”表面科学 376。 （出版中）。

S.Hasegawa: "Electrical functional properties of Surface superstructures on semiconductors" Advances in Colloid and Inferface Science. (印刷中).

S.Hasekawa：“半导体表面超结构的电功能特性”胶体和界面科学进展（正在出版）。