Sensitized Near-Infrared Emission of SiGe Nanocrystals via Heterostructuring with Quasi Two-Dimensional Perovskite

Yeonjoo Lee; Doyun Kim; Mircea Cotlet; Benjamin Kyle Derby; John Watt; Wanyi Nie; Eric G. Bowes; Sundar Kunwar; Uwe R. Kortshagen; Jinkyoung Yoo

doi:10.1021/acsami.5c00173

Sensitized Near-Infrared Emission of SiGe Nanocrystals via Heterostructuring with Quasi Two-Dimensional Perovskite

Yeonjoo Lee, Doyun Kim, Mircea Cotlet, Benjamin Kyle Derby, John Watt, Wanyi Nie, Eric G. Bowes, Sundar Kunwar, Uwe R. Kortshagen, Jinkyoung Yoo

Mechanical Engineering

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

Abstract

The near-infrared (NIR) emission of silicon-germanium alloy nanocrystals (SiGe NCs) was sensitized by heterostructuring with a quasi two-dimensional (Q-2D) perovskite (CsPbBr₃ blended with butylammonium bromide (BABr)). Colloidal SiGe NCs were synthesized by using a nonthermal plasma method with chloride precursors. As-synthesized SiGe NCs showed no detectable photoluminescence (PL). Embedding the SiGe NCs within the perovskite matrix via spin coating led to a heterostructure exhibiting dual emissions: green emission at 520 nm from the perovskite and NIR emission at 1035 nm from the SiGe NCs. Time-integrated and resolved PL measurements and transient absorption spectroscopy revealed energy transfer from the perovskite to the SiGe NCs, which sensitized the NIR emission from the SiGe NCs and quenched the green PL for the perovskite. These results demonstrate that Ge alloying can effectively tune the bandgap of Si NCs and highlight the feasibility of heterostructuring perovskites and photoluminescent NCs to enhance or activate their PL. This approach broadens their potential applications in the NIR region.

Original language	English (US)
Pages (from-to)	26968-26976
Number of pages	9
Journal	ACS Applied Materials and Interfaces
Volume	17
Issue number	18
DOIs	https://doi.org/10.1021/acsami.5c00173
State	Published - May 7 2025

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© 2025 American Chemical Society.

Keywords

SiGe nanocrystals
energy transfer
heterostructuring
hybrid perovskite
sensitization

PubMed: MeSH publication types

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10.1021/acsami.5c00173

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@article{42c6797ab56146ba934a1e2df1b4b809,

title = "Sensitized Near-Infrared Emission of SiGe Nanocrystals via Heterostructuring with Quasi Two-Dimensional Perovskite",

abstract = "The near-infrared (NIR) emission of silicon-germanium alloy nanocrystals (SiGe NCs) was sensitized by heterostructuring with a quasi two-dimensional (Q-2D) perovskite (CsPbBr3 blended with butylammonium bromide (BABr)). Colloidal SiGe NCs were synthesized by using a nonthermal plasma method with chloride precursors. As-synthesized SiGe NCs showed no detectable photoluminescence (PL). Embedding the SiGe NCs within the perovskite matrix via spin coating led to a heterostructure exhibiting dual emissions: green emission at 520 nm from the perovskite and NIR emission at 1035 nm from the SiGe NCs. Time-integrated and resolved PL measurements and transient absorption spectroscopy revealed energy transfer from the perovskite to the SiGe NCs, which sensitized the NIR emission from the SiGe NCs and quenched the green PL for the perovskite. These results demonstrate that Ge alloying can effectively tune the bandgap of Si NCs and highlight the feasibility of heterostructuring perovskites and photoluminescent NCs to enhance or activate their PL. This approach broadens their potential applications in the NIR region.",

keywords = "SiGe nanocrystals, energy transfer, heterostructuring, hybrid perovskite, sensitization",

author = "Yeonjoo Lee and Doyun Kim and Mircea Cotlet and Derby, \{Benjamin Kyle\} and John Watt and Wanyi Nie and Bowes, \{Eric G.\} and Sundar Kunwar and Kortshagen, \{Uwe R.\} and Jinkyoung Yoo",

note = "Publisher Copyright: {\textcopyright} 2025 American Chemical Society.",

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doi = "10.1021/acsami.5c00173",

language = "English (US)",

volume = "17",

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publisher = "American Chemical Society",

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TY - JOUR

T1 - Sensitized Near-Infrared Emission of SiGe Nanocrystals via Heterostructuring with Quasi Two-Dimensional Perovskite

AU - Lee, Yeonjoo

AU - Kim, Doyun

AU - Cotlet, Mircea

AU - Derby, Benjamin Kyle

AU - Watt, John

AU - Nie, Wanyi

AU - Bowes, Eric G.

AU - Kunwar, Sundar

AU - Kortshagen, Uwe R.

AU - Yoo, Jinkyoung

PY - 2025/5/7

Y1 - 2025/5/7

N2 - The near-infrared (NIR) emission of silicon-germanium alloy nanocrystals (SiGe NCs) was sensitized by heterostructuring with a quasi two-dimensional (Q-2D) perovskite (CsPbBr3 blended with butylammonium bromide (BABr)). Colloidal SiGe NCs were synthesized by using a nonthermal plasma method with chloride precursors. As-synthesized SiGe NCs showed no detectable photoluminescence (PL). Embedding the SiGe NCs within the perovskite matrix via spin coating led to a heterostructure exhibiting dual emissions: green emission at 520 nm from the perovskite and NIR emission at 1035 nm from the SiGe NCs. Time-integrated and resolved PL measurements and transient absorption spectroscopy revealed energy transfer from the perovskite to the SiGe NCs, which sensitized the NIR emission from the SiGe NCs and quenched the green PL for the perovskite. These results demonstrate that Ge alloying can effectively tune the bandgap of Si NCs and highlight the feasibility of heterostructuring perovskites and photoluminescent NCs to enhance or activate their PL. This approach broadens their potential applications in the NIR region.

AB - The near-infrared (NIR) emission of silicon-germanium alloy nanocrystals (SiGe NCs) was sensitized by heterostructuring with a quasi two-dimensional (Q-2D) perovskite (CsPbBr3 blended with butylammonium bromide (BABr)). Colloidal SiGe NCs were synthesized by using a nonthermal plasma method with chloride precursors. As-synthesized SiGe NCs showed no detectable photoluminescence (PL). Embedding the SiGe NCs within the perovskite matrix via spin coating led to a heterostructure exhibiting dual emissions: green emission at 520 nm from the perovskite and NIR emission at 1035 nm from the SiGe NCs. Time-integrated and resolved PL measurements and transient absorption spectroscopy revealed energy transfer from the perovskite to the SiGe NCs, which sensitized the NIR emission from the SiGe NCs and quenched the green PL for the perovskite. These results demonstrate that Ge alloying can effectively tune the bandgap of Si NCs and highlight the feasibility of heterostructuring perovskites and photoluminescent NCs to enhance or activate their PL. This approach broadens their potential applications in the NIR region.

KW - SiGe nanocrystals

KW - energy transfer

KW - heterostructuring

KW - hybrid perovskite

KW - sensitization

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U2 - 10.1021/acsami.5c00173

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JO - ACS Applied Materials and Interfaces

JF - ACS Applied Materials and Interfaces

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ER -

Sensitized Near-Infrared Emission of SiGe Nanocrystals via Heterostructuring with Quasi Two-Dimensional Perovskite

Abstract

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