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Infrared sensor by inkjet printing cytochrome c on suspending aluminum electrodes of post CMOS process
Author(s): Shuo-Feng Liang; Po-Hsien Yen; Guo-Dung John Su
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Paper Abstract

Cytochrome c protein thin film possesses a high temperature coefficient of resistance. In this paper, we systematically investigated the characteristics of cytochrome c, whose absorption coefficient is 65% at wavelengths of 8~12 μm. We found that the changes in resistance resulted from surface roughness. We also discovered that, while cytochrome c improves the temperature coefficient of resistance, a pure protein solution does not conduct well. It needs a buffer solution, acting as an electrolyte, to increase electrical conductance. However, the buffer solution decreases the temperature coefficient. Therefore, optimization of the ratio of cytochrome c protein to buffer solution is required. We determined the best mixing ratio of the protein solution for a sensing material. We then designed a chip for an infrared microbolometer with a MEMS structure of suspended aluminum electrodes. The protein solution was deposited on the sensing pixel using an inkjet printer. The temperature coefficient of resistance, thermal conductance, time constant and responsivity were 25.98%/K, 7.96 × 10-5 W/K, 1.094 ms and 2.57 × 105 V/W at 2 μA bias current, respectively. We experimentally demonstrated integrating cytochrome c protein with a CMOS circuit as a sensing pixel for a longwavelength infrared microbolometer. Based on our experimental results, such a microbolometer array holds promise for the future.

Paper Details

Date Published: 14 September 2016
PDF: 12 pages
Proc. SPIE 9973, Infrared Remote Sensing and Instrumentation XXIV, 997305 (14 September 2016); doi: 10.1117/12.2236861
Show Author Affiliations
Shuo-Feng Liang, National Taiwan Univ. (Taiwan)
Po-Hsien Yen, National Taiwan Univ. (Taiwan)
Guo-Dung John Su, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 9973:
Infrared Remote Sensing and Instrumentation XXIV
Marija Strojnik, Editor(s)

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