CuGaS 2 -CuInE 2 (E = S, Se) Colloidal Nanorod Heterostructures

Nuri Oh, Logan P. Keating, Gryphon A. Drake, Moonsub Shim

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Colloidal nanorod heterostructures of I-III-VI 2 semiconductors have been synthesized in a solution starting from wurtzite-like CuGaS 2 nanorods. Growth of CuInS 2 or CuInSe 2 on CuGaS 2 nanorods results in interesting sawtooth structures with larger lattice strain leading to sharper, more pronounced teeth. A final inorganic shell of ZnSe or ZnS grown on the CuGaS 2 /CuInSe 2 nanorod heterostructures enhances photoluminescence. Unusual brush-like structures arise with prolonged ZnSe growth. Time-resolved photoluminescence measurements on CuGaS 2 /CuInSe 2 /ZnS nanorod heterostructures reveal a lifetime approaching one microsecond, suggesting charge separation within the nanorods. The results shown here provide previously unknown nanorod heterostructures exhibiting interesting and potentially useful optical properties along with insights into heterostructure formation in colloidal I-III-VI 2 nanorods.

Original languageEnglish
Pages (from-to)1973-1980
Number of pages8
JournalChemistry of Materials
Volume31
Issue number6
DOIs
StatePublished - 2019 Mar 26

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Nanorods
Heterojunctions
Photoluminescence
Brushes
Optical properties
Semiconductor materials

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Oh, Nuri ; Keating, Logan P. ; Drake, Gryphon A. ; Shim, Moonsub. / CuGaS 2 -CuInE 2 (E = S, Se) Colloidal Nanorod Heterostructures In: Chemistry of Materials. 2019 ; Vol. 31, No. 6. pp. 1973-1980.
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CuGaS 2 -CuInE 2 (E = S, Se) Colloidal Nanorod Heterostructures . / Oh, Nuri; Keating, Logan P.; Drake, Gryphon A.; Shim, Moonsub.

In: Chemistry of Materials, Vol. 31, No. 6, 26.03.2019, p. 1973-1980.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Oh, Nuri

AU - Keating, Logan P.

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AB - Colloidal nanorod heterostructures of I-III-VI 2 semiconductors have been synthesized in a solution starting from wurtzite-like CuGaS 2 nanorods. Growth of CuInS 2 or CuInSe 2 on CuGaS 2 nanorods results in interesting sawtooth structures with larger lattice strain leading to sharper, more pronounced teeth. A final inorganic shell of ZnSe or ZnS grown on the CuGaS 2 /CuInSe 2 nanorod heterostructures enhances photoluminescence. Unusual brush-like structures arise with prolonged ZnSe growth. Time-resolved photoluminescence measurements on CuGaS 2 /CuInSe 2 /ZnS nanorod heterostructures reveal a lifetime approaching one microsecond, suggesting charge separation within the nanorods. The results shown here provide previously unknown nanorod heterostructures exhibiting interesting and potentially useful optical properties along with insights into heterostructure formation in colloidal I-III-VI 2 nanorods.

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