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北京石油化工学院2026年研究生招生接收调剂公告
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ZnZn7688

新虫 (小有名气)

[交流] 【请教】 type-I和type-II QDs的概念

看文献时碰到的,高手能帮忙解释下type-I和type-II QDs的概念波?
还有它们各有什么特征
小妹刚结束量子点,很多基本的概念都不太懂.
thx~~


[ Last edited by caosw2001 on 2009-2-26 at 08:56 ]
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yesido

金虫 (正式写手)

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memser(金币+2,VIP+0):感谢参与讨论,欢迎常来 2-25 22:36
主要是导带和价带位置不一样。
第一种是一个禁带宽度完全在另外一个禁带宽度之内
第二种一个的导带比第二个导带位置高,但是其价带的位置也比第二个高。
2楼2009-02-25 22:31:00
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frostmoon

金虫 (小有名气)

type-I QDs, where the band offsets are such that the conduction band of the shell (the higher band gap material) is of higher energy than that
of the core (the lower band gap material), and the valence band of
the shell is of lower energy than that of the core. As a result, both
electrons and holes are confined in the cores. A type-II QD, in
contrast, has both the valence and conduction bands in the core
lower (or higher) than in the shell. As a result, one carrier is mostly
confined to the core, while the other is mostly confined to the shell.
3楼2009-02-25 23:36:36
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refnew

专家顾问 (知名作家)


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caosw2001(金币+2,VIP+0):3x! 2-26 08:57
正确的理解是这样的

Three cases can be distinguished, denominated type-I, reverse type-I, and type-
II band alignment (cf. Figure 1). In the former, the bandgap of the shell material is larger than that of the core and both electrons and holes are confined in the core. In the second, the bandgap of the shell material is smaller than that of the core and, depending of the thickness of the shell, the holes and electrons are partially or completely confined in the shell. In the latter, either the valence-band edge or the conductionband edge of the shell material is located in the bandgap of the core.
4楼2009-02-26 08:31:23
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syigsy

至尊木虫 (著名写手)

四楼的是正解
5楼2009-02-26 08:39:20
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fggfnv

金虫 (小有名气)

这是指核壳结构吗
6楼2009-02-26 10:27:24
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haimlu

木虫 (正式写手)

应该是核壳的
7楼2009-02-26 11:08:50
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