DIRECT OBSERVATION OF COMPOSITIONALLY HOMOGENEOUS A-C-H BAND-GAP-MODULATED SUPERLATTICES

被引：36

作者：

DAVIS, CA ^{[1
]}

SILVA, SRP ^{[1
]}

DUNINBORKOWSKI, RE ^{[1
]}

AMARATUNGA, GAJ ^{[1
]}

KNOWLES, KM ^{[1
]}

STOBBS, WM ^{[1
]}

机构：

[1] UNIV CAMBRIDGE,DEPT ENGN,CAMBRIDGE CB2 1PZ,ENGLAND

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 23期

关键词：

D O I：

10.1103/PhysRevLett.75.4258

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

It is shown that amorphous hydrogenated carbon (a-C:H) band-gap-modulated superlattices can be observed by transmission electron microscopy. The layering proves to be well defined and it is demonstrated that changes in the band gap from 1.5 to 2.8 eV cannot be associated with ordered graphitic regions, in that crystalline regions larger than 0.5 nm are not observed. Differences in the amount of pi bonding are found to lead to changes in the average atomic scattering factor. It is suggested that the changes in pi bonding are associated with changes in local ordering that control the band gap.

引用

页码：4258 / 4261

页数：4

共 21 条

[1] AMORPHOUS-SEMICONDUCTOR SUPER-LATTICES [J].