Synthesis of tetrahedral quasi-type-II CdSe-CdS core-shell quantum dots
2011 (English)In: Nanotechnology, ISSN 0957-4484, E-ISSN 1361-6528, Vol. 22, no 42, 425202- p.Article in journal (Refereed) Published
Synthesis of colloidal nanocrystals of II-VI semiconductor materials has been refined in recent decades and their size dependent optoelectronic properties have been well established. Here we report a facile synthesis of CdSe-CdS core-shell heterostructures using a two-step hot injection process. Red-shifts in absorption and photoluminescence spectra show that the obtained quantum dots have quasi-type-II alignment of energy levels. The obtained nanocrystals have a heterostructure with a large and highly faceted tetrahedral CdS shell grown epitaxially over a spherical CdSe core. The obtained morphology as well as high resolution electron microscopy confirms that the tetrahedral shell have a zinc blende crystal structure. A phenomenological mechanism for the growth and morphology of the nanocrystals is discussed.
Place, publisher, year, edition, pages
2011. Vol. 22, no 42, 425202- p.
IdentifiersURN: urn:nbn:se:kth:diva-95416DOI: 10.1088/0957-4484/22/42/425202ISI: 000295467800003ScopusID: 2-s2.0-80053281966OAI: oai:DiVA.org:kth-95416DiVA: diva2:528263
QC 201205242012-05-242012-05-242016-05-19Bibliographically approved