Semiconducting amorphous Y-Ba-Cu-O: an attractive material for fast and sensitive thermal sensing in the NIR to THz range

Annick Dégardin; Vishal Jagtap; Xavier Galiano; Alain Kreisler

doi:10.1117/12.2546590

2 March 2020 Semiconducting amorphous Y-Ba-Cu-O: an attractive material for fast and sensitive thermal sensing in the NIR to THz range

Annick Dégardin, Vishal Jagtap, Xavier Galiano, Alain Kreisler

Author Affiliations +

Proceedings Volume 11279, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII; 1127909 (2020) https://doi.org/10.1117/12.2546590
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

Since the observation of pyroelectric properties in oxygen depleted semiconducting Y-Ba-Cu-O, the interest of its amorphous phase (a-YBCO) obtained at low deposition temperature (150 °C) has been demonstrated for near-infrared (NIR) detection. At the core of the uncooled thermal detector development, there is the material choice for sensing the incoming radiation. Apart from its manufacturing compatibility with silicon technologies for further integration with readout electronics, a low noise level and a high value of the pyroelectric coefficient are highly desirable material properties. In the first part of this paper, we investigate room temperature noise performances of planar and trilayer detectors fabricated on silicon substrates. The best noise equivalent power (NEP) and detectivity D^*, which are at the state of the art, were observed at 10 kHz modulation frequency: NEP = 2.0 pW/Hz^1/2 and D^* = 6.6×10⁹ cm·Hz^1/2/W for planar structures; NEP = 2.6 pW/Hz^1/2 and D^* = 5.7×10⁹ cm·Hz^1/2/W for trilayers. These detectors also exhibit a very fast response (time constant τ = 1.9 μs for planar, and τ = 0.12 μs for trilayer devices) as compared to commercially available pyroelectric sensors. In the second part, we examine the pyroelectric response of a-YBCO to extract the pyroelectric coefficient p. A first estimate of p gave a value as high as 600 μC·m⁻²·K⁻¹ at 300 K. The pyroelectric figure of merit F_d which takes into account dielectric properties of the material (dielectric constant and dielectric losses) is also discussed with respect to results published for pyroelectric oxide thin films sputtered on silicon substrates.

Conference Presentation

Citation Download Citation

Annick Dégardin, Vishal Jagtap, Xavier Galiano, and Alain Kreisler "Semiconducting amorphous Y-Ba-Cu-O: an attractive material for fast and sensitive thermal sensing in the NIR to THz range", Proc. SPIE 11279, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII, 1127909 (2 March 2020); https://doi.org/10.1117/12.2546590

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