Size and Emission Control of Wurtzite InP Nanocrystals Synthesized from Cu3-xP by Cation Exchange

David Stone, Xiang Li, Tom Naor, Jiekai Dai, Sergei Remennik, Uri Banin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Phosphide-based nanocrystals (NCs), including InP and Cu3-xP, are relevant for applications in light-emitting devices and catalysis, yet their synthetic design is limited in terms of size range and homogeneity. We report the synthesis of uniform and size-controlled emissive wurtzite-phase InP NCs formed via cation exchange from Cu3-xP. First, size-controlled Cu3-xP NCs are synthesized by the formation of metallic Cu0 NCs and their phosphidation to Cu3-xP. By changing the ligands and precursor concentrations, the NC size is varied between 5 and 13 nm. Using cation exchange, InP NCs are then generated. As the surface of InP NCs is prone to oxidation and defects that decrease their emission, we performed a reaction with NOBF4. This yields InP NCs with resolved absorption features and efficient band-gap emission as a result of impurity removal and surface passivation. The effect of water, acid, and halides on the balance of NC etching and surface passivation is studied. With this approach, high-quality wurtzite InP NCs are obtained while the emission is tuned between 810 and 600 nm. The obtained NCs are potential building blocks for catalytic and optoelectronic applications.

Original languageAmerican English
Pages (from-to)10594-10605
Number of pages12
JournalChemistry of Materials
Volume35
Issue number24
DOIs
StatePublished - 26 Dec 2023

Bibliographical note

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© 2023 American Chemical Society.

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