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

Research output: Contribution to journalArticlepeer-review

3 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 languageEnglish
Article number253102
JournalApplied Physics Letters
Volume107
Issue number25
DOIs
StatePublished - 21 Dec 2015

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