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Fast, Flexible Pyroelectric Infrared Detectors using Novel Electrode Materials

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Researchers
Prof Barbaros Özyilmaz
Özyilmaz Group
Centre for Advanced 2D Materials & Graphene
Managed By
Dr Tan Yan Ny (ilolekf@nus.edu.sg)
Manager (65)66012812
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Tech Offer 13384N Pyroelectric Infrared Detectors [PDF]

Fast, Flexible Pyroelectric Infrared Detectors using Novel Electrode Materials

Özyilmaz Group, Centre for Advanced 2D Materials & Graphene

Industry Problem

Thermal imaging with pyroelectric sensors is slow, mainly due to the materials used for the electrodes. These sensors are thus limited to applications such as motion detection, despite having the potential for being used in bio-imaging, security & surveillance and defense. Attempts have been made to increase the speed of these detectors, but this has come at the expense of sensitivity. That is, a faster detector will typically not have as high a sensitivity as a slower one.

Solution

Prof. Barbaros’ group has overcome the trade-off between speed & sensitivity, by developing an IR detector with novel electrode materials (NUS Electrode) that are IR transparent. This has resulted in a faster response time with no drop in sensitivity until 700 Hz (Figs. 1, 5). Device shows upper cutoff frequency f3dB of 681Hz, higher than typical pyroelectric sensors (<100Hz). Furthermore, our analysis (Fig. 2) indicates that our detectors ideally suited for the detection of warm bodies (37oC) such as human beings. Lastly, the NUS Electrode is compatible with various pyroelectric active materials and hence the operation range of the sensor can be tuned depending on the absorption layers chosen.

Keywords: Infra-red, detector, fast, flexible, electrode

 FIG. 1: Pyroelectric signal as a function of chopping frequency for various blackbody temperatures. Device shows upper cutoff frequency f3dB of 681Hz, higher than typical pyroelectric sensors (<100Hz). Our sensors show faster response due to IR transparent NUS Electrode => IR directly absorbed by pyroelectric material.

 FIG. 2: IR absorbance spectrum of pyroelectric active film (in red) overlaid with the emission of a blackbody at 310K (human being) in green. Detector is well suited for imaging of warm bodies. 

 FIG. 3: Sensor output (bottom) in response to stenciled infrared radiation (top), demonstrating its imaging capability.

 FIG. 4: Flexible IR detector array

 FIG. 5: Specific detectivity (D*) remains consistent until f3dB ~ 700Hz: 7x higher than conventional detectors. Our sensors thus allow faster thermal imaging than conventional pyroelectric detectors, without degradation in sensitivity.

Value Proposition

•  Fast thermal imaging (> 6X faster than conventional sensors).

•  High speed achieved without degradation to sensitivity.

•  Flexible IR sensor allowing for flexible electronics and wearables

•  Detector is originally well suited for imaging of warm bodies.

•  This can be tuned depending on the pyroelectric material.

Potential Application

•  IR camera

•  Motion sensing

•  Defense applications (eg. Night vision, missile detector)

For more information, contact:

NUS Industry Liaison Office

Case Manager: Tan Yan Ny

  :+65 6516 7175/ +65 66012812

  : iloquery@nus.edu.sg/ tan.yan.ny@nus.edu.sg

Principal Investigator: Prof Barbaros Özyilmaz Barbaros@nus.edu.sg

Acknowledgement

This research is supported by the National Research Foundation, Prime Minister’s Office, Singapore under its Competitive Research Program

(CRP Award No. NRF-CRP 9-2011-03)

Ref : ID13384N