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国家教育部博士点基金(20090076120010)

作品数:2 被引量:0H指数:0
发文基金:上海市教育委员会重点学科基金国家教育部博士点基金国家自然科学基金更多>>
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Influence of annealing conditions on impurity species in arsenic-doped HgCdTe grown by molecular beam epitaxy
2010年
Based on our previous work, the influence of annealing conditions on impurity species in in-situ arsenic (As)- doped Hg1-xCdxTe (x ≈ 0.3) grown by molecular beam epitaxy has been systematically investigated by modulated photoluminescence spectra. The results show that (i) the doped-As acting as undesirable shallow/deep levels in asgrown can be optimized under proper annealing conditions and the physical mechanism of the disadvantage of high activation temperature, commonly assumed to be more favourable for As activation, has been discussed as compared with the reports in the As-implanted HgCdTe epilayers (x ≈ 0.39), (ii) the density of VHg has an evident effect on the determination of bandgap (or composition) of epilayers and the excessive introduction of VHg will lead to a short-wavelength shift of epilayers, and (iii) the VHs prefers forming the VHg-ASHg complex when the inactivated-As (AsHg or related) coexists in a certain density, which makes it difficult to annihilate VHg in As-doped epilayers. As a result, the bandedge electronic structures of epilayers under different conditions have been drawn as a brief guideline for preparing extrinsic p-type epilayers or related devices.
越方禹陈璐李亚巍胡志高孙琳杨平雄褚君浩
The determination of the x value in doped Hg_(1-x)Cd_x Te by transmission spectra
2012年
Variable-temperature transmission/absorption spectra are measured on As-doped Hgl-xCdxTe grown by molec- ular beam epitaxy. The nonlinear temperature-dependent shift of the absorption edge is also observed, which is similar to our previous report on VHg (unintentionally)-doped HgCdTe. By referring to the empirical formulas of Eg(x,T), the x value of the epilayer is calculated and its inconsistency between the extreme temperatures (e.g. 10 and 300 K) is discussed. The results confirm the assumption of the effect of shallow levels on the shift of the absorption edge, and suggest that the x value (or Eg) in intrinsic/extrinsic-doped HgCdTe should be determined by referring to as low a temperature as possible (e.g. 10 K), and not the commonly used temperatures of 77 or 300 K, when the transmission spectrum should be employed. This can give brief guidelines for fabricating HgCdTe-related devices.
Yue Fang-YuChen LuLi Ya-WeiSun LinYang Ping-XiongChu Jun-Hao
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