Semiconductor quantum dots through conversion of micelle-generated metal clusters

Wahl, D.; Ladenburger, A.; Feneberg, M.; Schoch, W.; Thonke, K.; Sauer, R.
August 2009
Applied Physics Letters;8/31/2009, Vol. 95 Issue 9, p093105
Academic Journal
We introduce a method of producing semiconductor quantum dots that is essentially based on the conversion of metal clusters into semiconductor clusters. In the first step, metal dots are generated with the help of self-organizing diblock-copolymers. Then, in the second step, these metal dots are converted into traditional III-V or II-VI semiconductor quantum dots by adding the nonmetallic component. Unlike the commonly used Stranski–Krastanow growth method, our approach completely avoids the formation of an underlying wetting layer. It works basically for any combination of substrate and dot materials being independent of differences in the lattice constants of substrate and dots as are essential for the Stranski–Krastanow growth. Also, the self-ordering of the diblock copolymers is imposed on the metal dots and is retained during their conversion to the semiconductor dots. The dots form an array with average sizes and distances controlled by the partial length of the polymer chains allowing high flexibility for future applications.


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