Graphene-Based Thermopile for Thermal Imaging Applications

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• 作者：Allen L. Hsu ; Patrick K. Herring ; Nathaniel M. Gabor ; Sungjae Ha ; Yong Cheol Shin ; Yi Song ; Matthew Chin ; Madan Dubey ; Anantha P. Chandrakasan ; Jing Kong ; Pablo Jarillo-Herrero ; Tom谩s Palacios
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：November 11, 2015
• 年：2015
• 卷：15
• 期：11
• 页码：7211-7216
• 全文大小：412K
• ISSN：1530-6992

文摘

In this work, we leverage graphene鈥檚 unique tunable Seebeck coefficient for the demonstration of a graphene-based thermal imaging system. By integrating graphene based photothermo-electric detectors with micromachined silicon nitride membranes, we are able to achieve room temperature responsivities on the order of 鈭?鈥? V/W (at 位 = 10.6 渭m), with a time constant of 鈭?3 ms. The large responsivities, due to the combination of thermal isolation and broadband infrared absorption from the underlying SiN membrane, have enabled detection as well as stand-off imaging of an incoherent blackbody target (300鈥?00 K). By comparing the fundamental achievable performance of these graphene-based thermopiles with standard thermocouple materials, we extrapolate that graphene鈥檚 high carrier mobility can enable improved performances with respect to two main figures of merit for infrared detectors: detectivity (>8 脳 10⁸ cm Hz^1/2 W^鈥?) and noise equivalent temperature difference (<100 mK). Furthermore, even average graphene carrier mobility (<1000 cm² V^鈥? s^鈥?) is still sufficient to detect the emitted thermal radiation from a human target.