Broadband enhancement of infrared absorption in microbolometers using Ag nanocrystals

Jerome K. Hyun; Chi Won Ahn; Woo Choong Kim; Tae Hyun Kim; Moon Seop Hyun; Won Oh Lee; Hee Yeoun Kim; Jae Hong Park

doi:10.1063/1.4937900

Broadband enhancement of infrared absorption in microbolometers using Ag nanocrystals

Jerome K. Hyun, Chi Won Ahn, Woo Choong Kim, Tae Hyun Kim, Moon Seop Hyun, Won Oh Lee, Hee Yeoun Kim, Jae Hong Park

Department of Chemistry & Nanoscience

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

6 Scopus citations

Abstract

High performance microbolometers are widely sought for thermal imaging applications. In order to increase the performance limits of microbolometers, the responsivity of the device to broadband infrared (IR) radiation needs to be improved. In this work, we report a simple, quick, and cost-effective approach to modestly enhance the broadband IR response of the device by evaporating Ag nanocrystals onto the light entrance surface of the device. When irradiated with IR light, strong fields are built up within the gaps between adjacent Ag nanocrystals. These fields resistively generate heat in the nanocrystals and underlying substrate, which is transduced into an electrical signal via a resistive sensing element in the device. Through this method, we are able to enhance the IR absorption over a broadband spectrum and improve the responsivity of the device by ~ 11%.

Original language	English
Article number	253102
Journal	Applied Physics Letters
Volume	107
Issue number	25
DOIs	https://doi.org/10.1063/1.4937900
State	Published - 21 Dec 2015

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© 2015 AIP Publishing LLC.

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abstract = "High performance microbolometers are widely sought for thermal imaging applications. In order to increase the performance limits of microbolometers, the responsivity of the device to broadband infrared (IR) radiation needs to be improved. In this work, we report a simple, quick, and cost-effective approach to modestly enhance the broadband IR response of the device by evaporating Ag nanocrystals onto the light entrance surface of the device. When irradiated with IR light, strong fields are built up within the gaps between adjacent Ag nanocrystals. These fields resistively generate heat in the nanocrystals and underlying substrate, which is transduced into an electrical signal via a resistive sensing element in the device. Through this method, we are able to enhance the IR absorption over a broadband spectrum and improve the responsivity of the device by ~ 11%.",

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AU - Hyun, Jerome K.

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AU - Kim, Woo Choong

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AU - Hyun, Moon Seop

AU - Lee, Won Oh

AU - Kim, Hee Yeoun

AU - Park, Jae Hong

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Broadband enhancement of infrared absorption in microbolometers using Ag nanocrystals

Abstract

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