High resolution dopant profiling in the SEM, image widths and surface band-bending
High resolution dopant profiling in the SEM, image widths and surface band-bending
复制标题
SEM 中的高分辨率掺杂剂分析、图像宽度和表面带弯曲
DOI:
10.1088/1742-6596/126/1/012033
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发表时间:
2008
期刊:
影响因子:
--
通讯作者:
Chee K
中科院分区:
文献类型:
--
作者:
Chee K
To study the mechanisms of dopant contrast in secondary electron (SE) imaging in the SEM, we have measured the image widths of a series of thin p-doped layers in Si, from 1 nm upwards. We have used computer modelling to simulate the effects of surface band-bending due to a realistic density of surface states on the Si, and we have also calculated the magnitude of the external patch fields. We have found a good correlation between the intensity widths and slopes of experimentally measured SE images of thin p-doped layers and the calculated widths and slopes of the energy distributions across these layers at a depth of 5–10 nm below the surface. This is consistent with the mean escape depth of SEs in Si being about 7 nm. We conclude that doping contrast in the SEM is mainly a function of bulk built-in voltages modified by surface band-bending effects within about 5–10 nm of the surface.
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影响因子:
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通讯作者:
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影响因子:
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DOI:
--
发表时间:
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期刊:
影响因子:
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