Controllable Growth of Semiconductor Heterostructures Mediated by Bifunctional Ag2S Nanocrystals as Catalyst or Source-Host

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• 作者：Guoxing Zhu ; Zheng Xu
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：January 12, 2011
• 年：2011
• 卷：133
• 期：1
• 页码：148-157
• 全文大小：753K
• 年卷期：v.133,no.1(January 12, 2011)
• ISSN：1520-5126

文摘

We demonstrate that Ag₂S nanocrystals are the bifunctional mediator for controllable growth of semiconductor heterostructures including more complicated multisegments heterostructures in solution-phase, which is a new type of nanomediator and quite different from the metal nanoparticle catalyst. The intrinsic high Ag⁺ ion mobility makes Ag₂S nanocrystals not only exhibit excellent catalytic function for growth of metal sulfide heterostructures but also act as a source-host for growth of ternary semiconductor heterostructures, for example, Ag₂S-AgInS₂. The semiconductors grow epitaxially from or inward in Ag₂S nanocrystals forming single-crystalline heterostructures. Moreover, the method developed here also can construct multisegments heterostructures, for example, Ag₂S-CdS-ZnS, AgInS₂-Ag₂S-AgInS₂. The interfacial structure is still stable even if the lattice mismatch is quite large, which is a unique feature of this method.