AgInS2-ZnS quantum dots: Excited state interactions with TiO2 and Photovoltaic Performance

Steven M. Kobosko; Danilo H. Jara; Prashant V. Kamat

doi:10.1021/acsami.6b14604

AgInS2-ZnS quantum dots: Excited state interactions with TiO₂ and Photovoltaic Performance

Steven M. Kobosko, Danilo H. Jara, Prashant V. Kamat

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

87 Scopus citations

Abstract

Multinary quantum dots such as AgInS2 and alloyed AgInS2-ZnS are an emerging class of semiconductor materials for applications in photovoltaic and display devices. The nanocrystals of (AgInS2)_x-(ZnS)_1-x (for x = 0.67) exhibit a broad emission with a maximum at 623 nm and interact strongly with TiO2 nanostructures by injecting electrons from the excited state. The electron transfer rate constant as determined from transient absorption spectroscopy was 1.8 × 10¹⁰ s^-1. The photovoltaic performance was evaluated over a period of a few weeks to demonstrate the stability of AgInS2-ZnS when utilized as sensitizers in solar cells. We report a power conversion efficiency of 2.25% of our champion cell 1 month after its fabrication. The limitations of AgInS2-ZnS nanocrystals in achieving greater solar cell efficiency are discussed.

Original language	English
Pages (from-to)	33379-33388
Number of pages	10
Journal	ACS Applied Materials and Interfaces
Volume	9
Issue number	39
DOIs	https://doi.org/10.1021/acsami.6b14604
State	Published - 4 Oct 2017
Externally published	Yes

Keywords

AginS
Electron transfer
Emission quenching
Quantum dots
Solar cells

Access to Document

10.1021/acsami.6b14604

Cite this

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title = "AgInS2-ZnS quantum dots: Excited state interactions with TiO2 and Photovoltaic Performance",

abstract = "Multinary quantum dots such as AgInS2 and alloyed AgInS2-ZnS are an emerging class of semiconductor materials for applications in photovoltaic and display devices. The nanocrystals of (AgInS2)x-(ZnS)1-x (for x = 0.67) exhibit a broad emission with a maximum at 623 nm and interact strongly with TiO2 nanostructures by injecting electrons from the excited state. The electron transfer rate constant as determined from transient absorption spectroscopy was 1.8 × 1010 s-1. The photovoltaic performance was evaluated over a period of a few weeks to demonstrate the stability of AgInS2-ZnS when utilized as sensitizers in solar cells. We report a power conversion efficiency of 2.25% of our champion cell 1 month after its fabrication. The limitations of AgInS2-ZnS nanocrystals in achieving greater solar cell efficiency are discussed.",

keywords = "AginS, Electron transfer, Emission quenching, Quantum dots, Solar cells",

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AU - Kobosko, Steven M.

AU - Jara, Danilo H.

AU - Kamat, Prashant V.

PY - 2017/10/4

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N2 - Multinary quantum dots such as AgInS2 and alloyed AgInS2-ZnS are an emerging class of semiconductor materials for applications in photovoltaic and display devices. The nanocrystals of (AgInS2)x-(ZnS)1-x (for x = 0.67) exhibit a broad emission with a maximum at 623 nm and interact strongly with TiO2 nanostructures by injecting electrons from the excited state. The electron transfer rate constant as determined from transient absorption spectroscopy was 1.8 × 1010 s-1. The photovoltaic performance was evaluated over a period of a few weeks to demonstrate the stability of AgInS2-ZnS when utilized as sensitizers in solar cells. We report a power conversion efficiency of 2.25% of our champion cell 1 month after its fabrication. The limitations of AgInS2-ZnS nanocrystals in achieving greater solar cell efficiency are discussed.

AB - Multinary quantum dots such as AgInS2 and alloyed AgInS2-ZnS are an emerging class of semiconductor materials for applications in photovoltaic and display devices. The nanocrystals of (AgInS2)x-(ZnS)1-x (for x = 0.67) exhibit a broad emission with a maximum at 623 nm and interact strongly with TiO2 nanostructures by injecting electrons from the excited state. The electron transfer rate constant as determined from transient absorption spectroscopy was 1.8 × 1010 s-1. The photovoltaic performance was evaluated over a period of a few weeks to demonstrate the stability of AgInS2-ZnS when utilized as sensitizers in solar cells. We report a power conversion efficiency of 2.25% of our champion cell 1 month after its fabrication. The limitations of AgInS2-ZnS nanocrystals in achieving greater solar cell efficiency are discussed.

KW - AginS

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