High <i>T</i>
                  <i>c</i> superconductor bolometer with record performance

Brasunas, J. C.; Lakew, B.

doi:10.1063/1.111010

Cited by 54 publications

(24 citation statements)

References 8 publications

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“…The conventional bolometric effect has been applied to HTSC films and has shown the capability to detect the incident light. [3][4][5][6] Several works have been made to improve the performance of HTSC bolometers. [7][8][9] For example, the responsivity can be enhanced by prolonging the bolometer from a microbridge to a meandering type or by thinning of the substrate.…”

Section: ͓S0003-6951͑96͒01119-9͔mentioning

confidence: 99%

Bolometric detection in a precipitation free Y1Ba2Cu3O7−δ film at 77 K

Chou

Chen

Hong

et al. 1996

Applied Physics Letters

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A photodetector with high responsivity has been fabricated with a high quality Y1Ba2Cu3O7−δ film on a regular SrTiO3 (100) substrate that has no thinning or etching. The film exhibits a precipitation-free morphology and has an extremely smooth surface having a rms roughness smaller than 5 nm. The film was patterned into a 25×650 μm2 long microbridge by a conventional photolithography technique. The Tco of the microbridge can be tuned by applying different bias currents, which results in a tunable operation temperature of the photodetector at 77.35±1 K. This makes it operationally more practical and economical. The noise voltage at 10 mA bias current is less than the resolution of our setup, 15 nV Hz−0.5. A high responsivity of 2.3×103 V/W was obtained when a bias current of 8 mA and a low power density He–Ne laser of 0.08 J/cm2 s chopped at 2 Hz were applied on the microbridge at 77.35 K. Under the same condition, the noise equivalent power (NEP) and detectivity (D*) have been measured to be 4.34×10−12 W Hz−0.5 and 3×109 cm Hz0.5 W−1, respectively.

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Section: ͓S0003-6951͑96͒01119-9͔mentioning

confidence: 99%

Bolometric detection in a precipitation free Y1Ba2Cu3O7−δ film at 77 K

Chou

Chen

Hong

et al. 1996

Applied Physics Letters

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“…Several groups have built YBaCuO superconductor microbolometer arrays employing silicon micromachining techniques. [1][2][3] These have shown detectivities as high as 6ϫ10 9 cm Hz 1/2 /W but require cooling to liquid nitrogen temperatures for operation. They are also potentially unstable because of the positive value of the temperature coefficient of resistance ͑TCR͒, which causes thermal runaway and pushes the device temperature above the effective temperature range of operation where dR/dT is high, mainly the superconducting transition region.…”

Section: Introductionmentioning

confidence: 99%

Investigation of semiconducting YBaCuO thin films: A new room temperature bolometer

Shan

Çelik‐Butler

Butler

et al. 1996

Journal of Applied Physics

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Articles you may be interested inCrystallization and pyroelectric effect of semiconducting YBaCuO thin films deposited at different temperatures A sensitive YBaCuO thin film bolometer with ultrawide wavelength responseWe explore the application of the semiconducting phases of YBaCuO thin films as a bolometer for uncooled infrared detection. For this study, four different structures were built with different types of buffer layers: YBaCuO on a Si substrate with and without a MgO buffer layer, and on an oxidized Si substrate with and without a MgO buffer layer. These films were all amorphous without a detectable long range order. For comparison, crystalline tetragonal YBa 2 Cu 3 O 6.5 and YBa 2 Cu 3 O 6.3 thin films on a LaAlO 3 substrate were included into the study. All six films exhibited semiconducting resistance versus temperature characteristics. The bolometer figures of merit, responsivity, and detectivity were calculated from the measured temperature coefficient of resistance ͑TCR͒ and the inherent noise characteristics of the temperature sensing element. The room temperature TCRs for all four amorphous films were greater than 2.5% K Ϫ1 . The highest TCR of 4.02% K Ϫ1 was observed on the amorphous YBaCuO thin film deposited on MgO/Si without a SiO 2 layer. The TCR of the tetragonal films, on the other hand, remained 2% K Ϫ1 or less in the same temperature range. Noise measurements performed in the 1-100 Hz frequency range revealed a quadratic dependence on the bias current as would be expected from ohmic electrical characteristics. The Johnson and 1/f regions were clearly identified in the noise spectrum. From TCR and noise measurements, we estimated the amorphous semiconducting YBaCuO bolometers would have a responsivity as high as 3.8ϫ10 5 V/W and a detectivity as high as 1.6ϫ10 9 cm Hz 1/2 /W for 1 A bias current and frame frequency of 30 Hz if integrated with a typical air-gap thermal isolation structure.

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“…Since the discovery of high-T c superconductors (HTS), much attention has been focused on the application of these materials in different types of bolometers for the near and far infrared wavelength regime [1][2][3][4][5][6][7][8]. High temperature superconductor transition edge bolometers are one of the prominent devices that can be used to detect electromagnetic radiation over the whole spectrum from X-ray to the far infrared wavelength range.…”

Section: Introductionmentioning

confidence: 99%

The superconducting transition width and illumination wavelength dependence of the response of MgO substrate YBCO transition edge bolometers

Öktem¹,

Bozbey²,

Avci³

et al. 2007

Physica C: Superconductivity

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Dependence of the phase and magnitude of the response of MgO substrate YBa 2 Cu 3 O 7Àd (YBCO) transition edge bolometers to the near infrared radiation on the superconducting transition width is presented in this work. The bolometers were made of YBCO thin films of 200 nm thickness that were grown on single crystal MgO (1 0 0) substrates by DC inverted cylindrical magnetron sputtering. We have measured the responses of both large and small area devices with respect to the bias temperature and radiation modulation frequency. We have observed that the superconducting transition width has major effects on the response of the bolometers such as; on a dip of the phase of the response versus modulation frequency curve around 1 Hz, the rate of decrease of the magnitude of the response, and dependence of the phase of the response on temperature at mid-range modulation frequency. We have investigated a correlation between the superconducting transition width and the YBCO film surface morphology of the devices. In addition, the illumination wavelength dependence of the optical response of both wide and narrow transition width devices has been investigated. Here we present the analysis and the possible mechanisms that can affect the response of the bolometers at the superconducting transition region.

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High T c superconductor bolometer with record performance

Cited by 54 publications

References 8 publications

Bolometric detection in a precipitation free Y1Ba2Cu3O7−δ film at 77 K

Bolometric detection in a precipitation free Y1Ba2Cu3O7−δ film at 77 K

Investigation of semiconducting YBaCuO thin films: A new room temperature bolometer

The superconducting transition width and illumination wavelength dependence of the response of MgO substrate YBCO transition edge bolometers

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