Synthesis of Extremely Small InP Quantum Dots and Electronic Coupling in Their Disordered Solid Films

Olga I. Mićić; S. P. Ahrenkiel; Arthur J. Nozik

doi:10.1063/1.1379990

Synthesis of Extremely Small InP Quantum Dots and Electronic Coupling in Their Disordered Solid Films

Olga I. Mićić, S. P. Ahrenkiel, Arthur J. Nozik

Chemistry and Nanoscience

National Renewable Energy Laboratory

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

217 Scopus Citations

Abstract

Extremely small colloidal InP quantum dots (QDs) with diameters ranging from 15 to 23 Å were synthesized, and the optical properties of close-packed arrays of these dots were studied. The isolated QDs in dilute colloidal solution exhibit pronounced discrete absorption spectra, indicating a narrow size distribution. The absorption spectra of close-packed solids of ∼ 18 Å diameter QDs with interdot spacings of 9 and 18 Å show that the absorption onsets and excitonic peaks are, respectively, redshifted and broadened in going from dilute solution to close-packed solids. These results can be explained by electron delocalization in disordered close-packed solids; the spacing of electronic levels in the QDs is reduced and produces a redshift in the absorption spectra.

Original language	American English
Pages (from-to)	4022-4024
Number of pages	3
Journal	Applied Physics Letters
Volume	78
Issue number	25
DOIs	https://doi.org/10.1063/1.1379990 https://doi.org/10.1063/1.1379990
State	Published - 2001

NREL Publication Number

NREL/JA-590-29896

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title = "Synthesis of Extremely Small InP Quantum Dots and Electronic Coupling in Their Disordered Solid Films",

abstract = "Extremely small colloidal InP quantum dots (QDs) with diameters ranging from 15 to 23 {\AA} were synthesized, and the optical properties of close-packed arrays of these dots were studied. The isolated QDs in dilute colloidal solution exhibit pronounced discrete absorption spectra, indicating a narrow size distribution. The absorption spectra of close-packed solids of ∼ 18 {\AA} diameter QDs with interdot spacings of 9 and 18 {\AA} show that the absorption onsets and excitonic peaks are, respectively, redshifted and broadened in going from dilute solution to close-packed solids. These results can be explained by electron delocalization in disordered close-packed solids; the spacing of electronic levels in the QDs is reduced and produces a redshift in the absorption spectra.",

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year = "2001",

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T1 - Synthesis of Extremely Small InP Quantum Dots and Electronic Coupling in Their Disordered Solid Films

AU - Mićić, Olga I.

AU - Ahrenkiel, S. P.

AU - Nozik, Arthur J.

PY - 2001

Y1 - 2001

N2 - Extremely small colloidal InP quantum dots (QDs) with diameters ranging from 15 to 23 Å were synthesized, and the optical properties of close-packed arrays of these dots were studied. The isolated QDs in dilute colloidal solution exhibit pronounced discrete absorption spectra, indicating a narrow size distribution. The absorption spectra of close-packed solids of ∼ 18 Å diameter QDs with interdot spacings of 9 and 18 Å show that the absorption onsets and excitonic peaks are, respectively, redshifted and broadened in going from dilute solution to close-packed solids. These results can be explained by electron delocalization in disordered close-packed solids; the spacing of electronic levels in the QDs is reduced and produces a redshift in the absorption spectra.

AB - Extremely small colloidal InP quantum dots (QDs) with diameters ranging from 15 to 23 Å were synthesized, and the optical properties of close-packed arrays of these dots were studied. The isolated QDs in dilute colloidal solution exhibit pronounced discrete absorption spectra, indicating a narrow size distribution. The absorption spectra of close-packed solids of ∼ 18 Å diameter QDs with interdot spacings of 9 and 18 Å show that the absorption onsets and excitonic peaks are, respectively, redshifted and broadened in going from dilute solution to close-packed solids. These results can be explained by electron delocalization in disordered close-packed solids; the spacing of electronic levels in the QDs is reduced and produces a redshift in the absorption spectra.

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DO - 10.1063/1.1379990

M3 - Article

AN - SCOPUS:17844377853

SN - 0003-6951

VL - 78

SP - 4022

EP - 4024

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 25

ER -

Synthesis of Extremely Small InP Quantum Dots and Electronic Coupling in Their Disordered Solid Films

Abstract

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