MELTING IN SEMICONDUCTOR NANOCRYSTALS
MELTING IN SEMICONDUCTOR NANOCRYSTALS
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DOI：
10.1126/science.256.5062.1425
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发表时间：
1992-06-05
期刊：
影响因子：
56.9
通讯作者：
ALIVISATOS, AP
中科院分区：
文献类型：
--
作者：
GOLDSTEIN, AN;ECHER, CM;ALIVISATOS, AP
当晶体的一个或多个维度被缩小到与体电子离域长度（数十到数百埃）相当的尺寸时，半导体中出现了新的物理学。随着制造微晶体的技术的发展，“量子点”或半导体纳米晶体的性质现在正在研究中。CdS纳米晶体的变温电子衍射研究表明，随着尺寸的减小，熔化温度会降低，因为原子总数中的较大部分在表面上。热稳定性可能在决定半导体纳米晶体的用途中起作用。
New physics occurs in semiconductors when one or more dimensions of the crystal are reduced to a size comparable to bulk electron delocalization lengths (tens to hundreds of angstroms). The properties of "quantum dots" or semiconductor nanocrystals are now being studied, as techniques to fabricate the crystallites are developed. Temperature-dependent electron diffraction studies on nanocrystals of CdS show a large depression in the melting temperature with decreasing size, as a larger fraction of the total number of atoms is on the surface. Thermal stability may play a role in determining the uses of semiconductor nanocrystals.