Tuning the Synthesis of Ternary Lead Chalcogenide Quantum Dots by Balancing Precursor Reactivity

Danielle K. Smith; Joseph M. Luther; Octavi E. Semonin; Arthur J. Nozik; Matthew C. Beard

doi:10.1021/nn102878u

Tuning the Synthesis of Ternary Lead Chalcogenide Quantum Dots by Balancing Precursor Reactivity

Danielle K. Smith, Joseph M. Luther, Octavi E. Semonin, Arthur J. Nozik, Matthew C. Beard

Research output: Contribution to journal › Article › peer-review

130 Scopus Citations

Abstract

We report the synthesis and characterization of composition-tunable ternary lead chalcogenide alloys PbSe_xTe_1-x, PbS _xTe_1-x, and PbS_xSe_1-x. This work explores the relative reaction rates of chalcogenide precursors to produce alloyed quantum dots (QDs), and we find the highly reactive bis(trimethylsilyl) (TMS2)-based precursors allow for the homogeneous incorporation of anions. By varying the Pb to oleic acid ratio, we demonstrate size control of similar composition alloys. We find the resulting QDs are Pb-rich but the Pb/anion ratio is size-and composition-dependent in all alloyed QD as well as in PbSe, PbTe, and PbS QDs and is consistent with the reaction rates of the anion precursors. A more reactive anion precursor results in a lower Pb/anion ratio.

Original language	American English
Pages (from-to)	183-190
Number of pages	8
Journal	ACS Nano
Volume	5
Issue number	1
DOIs	https://doi.org/10.1021/nn102878u https://doi.org/10.1021/nn102878u
State	Published - 2011

NREL Publication Number

NREL/JA-5900-49966

Keywords

Alloys
Colloidal quantum dots
Heterostructures
Lead chalcogenides
Nanoparticles
Ternary

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abstract = "We report the synthesis and characterization of composition-tunable ternary lead chalcogenide alloys PbSexTe1-x, PbS xTe1-x, and PbSxSe1-x. This work explores the relative reaction rates of chalcogenide precursors to produce alloyed quantum dots (QDs), and we find the highly reactive bis(trimethylsilyl) (TMS2)-based precursors allow for the homogeneous incorporation of anions. By varying the Pb to oleic acid ratio, we demonstrate size control of similar composition alloys. We find the resulting QDs are Pb-rich but the Pb/anion ratio is size-and composition-dependent in all alloyed QD as well as in PbSe, PbTe, and PbS QDs and is consistent with the reaction rates of the anion precursors. A more reactive anion precursor results in a lower Pb/anion ratio.",

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AU - Luther, Joseph M.

AU - Semonin, Octavi E.

AU - Nozik, Arthur J.

AU - Beard, Matthew C.

PY - 2011

Y1 - 2011

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AB - We report the synthesis and characterization of composition-tunable ternary lead chalcogenide alloys PbSexTe1-x, PbS xTe1-x, and PbSxSe1-x. This work explores the relative reaction rates of chalcogenide precursors to produce alloyed quantum dots (QDs), and we find the highly reactive bis(trimethylsilyl) (TMS2)-based precursors allow for the homogeneous incorporation of anions. By varying the Pb to oleic acid ratio, we demonstrate size control of similar composition alloys. We find the resulting QDs are Pb-rich but the Pb/anion ratio is size-and composition-dependent in all alloyed QD as well as in PbSe, PbTe, and PbS QDs and is consistent with the reaction rates of the anion precursors. A more reactive anion precursor results in a lower Pb/anion ratio.

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KW - Colloidal quantum dots

KW - Heterostructures

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KW - Nanoparticles

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Tuning the Synthesis of Ternary Lead Chalcogenide Quantum Dots by Balancing Precursor Reactivity

Abstract

NREL Publication Number

Keywords

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