DIRECT OBSERVATION OF COMPOSITIONALLY HOMOGENEOUS A-C-H BAND-GAP-MODULATED SUPERLATTICES
DIRECT OBSERVATION OF COMPOSITIONALLY HOMOGENEOUS A-C-H BAND-GAP-MODULATED SUPERLATTICES
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DOI：
10.1103/physrevlett.75.4258
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发表时间：
1995-12-04
影响因子：
8.6
通讯作者：
STOBBS, WM
中科院分区：
文献类型：
--
作者：
DAVIS, CA;SILVA, SRP;STOBBS, WM
结果表明，用透射电子显微镜可以观察到非晶氢化碳（a-C：H）带隙调制超晶格。分层被证明是很好地定义，它表明，从1.5至2.8 eV的带隙的变化不能与有序的石墨区域，在该结晶区域大于0.5 nm没有观察到。发现π键合量的差异导致平均原子散射因子的变化。有人建议，在π键的变化与控制带隙的局部排序的变化。
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.