Strain-Driven Stacking Faults in CdSe/CdS Core/Shell Nanorods

• DOI: 10.1021/acs.jpclett.8b00914
• Publication Date: 2018-03-28T18:56:17Z
• Authors: Arnaud Demortière; Donovan N. Leonard; Valeri Petkov; Karena Chapman; Soma Chattopadhyay; Chunxing She; David A. Cullen; Tomohiro Shibata; Matthew Pelton; Elena V. Shevchenko
• Keywords: Nanorod

Colloidal semiconductor nanocrystals are commonly grown with a shell of second material to obtain desired physical properties, such as increased photoluminescence quantum yield. However, the growth lattice-mismatched results in strain within nanocrystal, and this has potential produce crystalline defects. Here, we study CdSe/CdS core/shell nanorods model system investigate influence core size shape on formation stacking faults nanocrystal. Using combination high-angle annular dark-field scanning transmission electron microscopy pair-distribution-function analysis synchrotron X-ray scattering, show that CdS smaller, spherical CdSe cores relatively small few faults. By contrast, larger, prolate spheroidal leads significant lattice, resulting high density