Why Do Colloidal Wurtzite Semiconductor Nanoplatelets Have an Atomically Uniform Thickness of Eight Monolayers?

Yingping Pang, Minyi Zhang, Dechao Chen, Wei Chen, Fei Wang, Shaghraf Javaid Anwar, Martin Saunders, Matthew R. Rowles, Lihong Liu, Shaomin Liu, Amit Sitt, Chunsen Li, Guohua Jia

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Herein we employed a first-principles method based on density functional theory to investigate the surface energy and growth kinetics of wurtzite nanoplatelets to elucidate why nanoplatelets exhibit a uniform thickness of eight monolayers. We synthesized a series of wurtzite nanoplatelets (ZnSe, ZnS, ZnTe, and CdSe) with an atomically uniform thickness of eight monolayers. As a representative example, the growth mechanism of 1.39 nm thick (eight monolayers) wurtzite ZnSe nanoplatelets was studied to substantiate the proposed growth kinetics. The results show that the growth of the seventh and eighth layers along the [112 0] direction of 0.99 nm (six monolayers) ZnSe magic-size nanoclusters is accessible, whereas the growth of the ninth layer is unlikely to occur because the formation energy is large. This work not only gives insights into the synthesis of atomically uniform thick wurtzite semiconductor nanoplatelets but also opens up new avenues to their applications in light-emitting diodes, catalysis, detectors, and lasers.

Original languageEnglish
Pages (from-to)3465-3471
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume10
Issue number12
DOIs
Publication statusPublished - 20 Jun 2019

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