Infrared sensor by inkjet printing cytochrome c on suspending aluminum electrodes of post CMOS process

Shuo-Feng Liang; Po-Hsien Yen; Guo-Dung John Su

doi:10.1117/12.2236861

14 September 2016 Infrared sensor by inkjet printing cytochrome c on suspending aluminum electrodes of post CMOS process

Shuo-Feng Liang, Po-Hsien Yen, Guo-Dung John Su

Author Affiliations +

Proceedings Volume 9973, Infrared Remote Sensing and Instrumentation XXIV; 997305 (2016) https://doi.org/10.1117/12.2236861
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States

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.

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Shuo-Feng Liang, Po-Hsien Yen, and Guo-Dung John Su "Infrared sensor by inkjet printing cytochrome c on suspending aluminum electrodes of post CMOS process", Proc. SPIE 9973, Infrared Remote Sensing and Instrumentation XXIV, 997305 (14 September 2016); https://doi.org/10.1117/12.2236861

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KEYWORDS

Proteins

Resistance

Microbolometers

Inkjet technology

Thin films

Printing

Infrared sensors

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