Elastic and Piezoelectric Characteristics of Wurtzite GaN/AlN Semiconductor Quantum Dots
نویسندگان
چکیده
منابع مشابه
Semiconductor Quantum Dots
The “Standard Model” of the Electronic Structure of Dots Progress made in the growth of “freestanding” (e.g., colloidal) quantum dotslt2 (see also articles in this issue by Nozik and MiCi6, and by Alivisatos) and in the growth of semiconductor-embedded (“self-assembled”) dots3p4 (see also the article by Bimberg, Grundmann, and Ledentsov in this issue) has opened the door to new and exciting spe...
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Cdo.5Mno.5S diluted magnetic semiconductor (DMS) quantum dots (QDs) of crystallite size ranging from 24 A to the bulk have been chemically synthesized using an aqueous solution precipitation method and thermal annealing. Subsequent characterization indicates that the "as prepared" material is of the cubic zinc blende structure which evolves with increasing size to the bulk hexagonal wurtzite st...
متن کاملOptical properties of wurtzite and zinc-blende GaNÕAlN quantum dots
We investigate theoretically and compare optical properties of wurtzite and zinc-blende GaN/AlN quantum dots with heights from 1.5 to 4.5 nm. The quantum dot size corresponds to the strong quantum confinement regime. It has been established that the built-in piezoelectric field at the GaN/AlN interface governs optical properties of wurtzite quantum dots while having a small effect on zinc-blend...
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We have investigated exciton states in wurtzite GaN/AlN and ZnO quantum dots. A strong piezoelectric field in GaN/AlN quantum dots is found to tilt conduction and valence bands, thus pushing the electron to the top and the hole to the bottom of the GaN/AlN quantum dot. As a result, the exciton ground state energy in GaN/AlN quantum dots with heights larger than 3 nm exhibits a red shift with re...
متن کاملWurtzite ZnSe quantum dots: Synthesis, characterization and PL properties
One-pot, facile solution phase approach is explored for the fabrication of uniform and nearly monodispersed colloidal ZnSe semiconductor quantum dots (QDs). ZnSe QDs have been synthesized by wet chemical, template free process by Zink acetate and elemental Selenium powder in presence of ethylene glycol, hydrazine hydrate and a defined amount of water at 70C. The product was in strong quantum co...
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ژورنال
عنوان ژورنال: Solid State Phenomena
سال: 2007
ISSN: 1662-9779
DOI: 10.4028/www.scientific.net/ssp.121-123.913