Modified lead titanate thin films for pyroelectric infrared detectors on gold electrodes

Ahmed, Moinuddin; Butler, Donald P.

doi:10.1016/j.infrared.2015.01.028

Cited by 6 publications

(4 citation statements)

References 24 publications

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“…The highest current value and the smoothest trend of increase in pyroelectric current were found for the PCT films deposited at 550 • C and annealed at 600 • C. For films deposited at 550 • C and annealed at 600 • C, the pyroelectric current through the capacitors starts at 2 pA at 30 • C and increases with temperature to 14 pA at 70 • C. Samples annealed at other temperatures showed a similar trend, although the PCT film deposited at either 550 • C or 600 • C shows better crystal qualities as well as a higher pyrocurrent. Our results of the increase in the pyroelectric current for PCT samples followed a similar trend reported in other studies [19][20][21][22][23][24][25][26][27][28].…”

Section: Electrical Properties Of Pct Filmssupporting

confidence: 91%

“…It can be seen that the best value obtained for the pyroelectric coefficient at room temperature (30 • C) was from the film deposited at 550 • C and annealed at 600 • C sample which is~2 µC/(m 2 •K). This value is lower than the values reported by others [18,19,21]. Similar to the pyroelectric current, the 550 • C and 600 • C deposited and annealed PCT films had smoother trends among all.…”

Section: Electrical Properties Of Pct Filmscontrasting

confidence: 54%

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Electro-Optical Properties of Sputtered Calcium Lead Titanate Thin Films for Pyroelectric Detection

et al. 2020

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We report the deposition and characterization of calcium lead titanate (PCT) thin films for pyroelectric detectors. PCT films of thicknesses ranging from ~250 to 400 nm were deposited on both silicon and Si/SiN/Ti/Au substrates at 13 mTorr pressure by 200W radio frequency sputtering in an Ar + O2 environment. Substrates were kept at variable temperatures during the deposition. The PCT films were annealed at various temperatures in an O2 environment for 15 min. X-ray diffraction results confirm the polycrystalline nature of these films. Energy dispersive spectroscopy function of scanning electron microscope showed that the films are stoichiometric (Ca0.43Pb0.57) TiO3 (Ca/Ti = 0.5, Pb/Ti = 0.66). Temperature dependence of capacitance, pyroelectric current, and pyroelectric coefficient was investigated for different PCT films. Our results show that films deposited at 550 °C and 600 °C demonstrate better quality and larger values of the pyroelectric coefficient. On the other hand, the capacitance fabricated on the PCT films at 550 °C showed the highest value of pyroelectric current and pyroelectric coefficient which were 14 pA and at 30 °C was ~2 µC/m2K respectively at a higher temperature. In addition, we used density functional theory to determine the atomic and band structure, real and imaginary parts of dielectric constant and refractive index, and absorption and reflection constants with energy.

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Section: Electrical Properties Of Pct Filmssupporting

confidence: 91%

Section: Electrical Properties Of Pct Filmscontrasting

confidence: 54%

Electro-Optical Properties of Sputtered Calcium Lead Titanate Thin Films for Pyroelectric Detection

et al. 2020

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“…The room temperature operation of such a detector allows a reduction in cost, size, and complexity. In view of miniaturization, dielectric material thin films exhibiting complementary metal oxide semiconductor (CMOS) compatibility for integrating the devices with their readout electronics have been largely investigated: lead zirconate titanate (PZT) 1 , lithium tantalate (LiTaO 3 ) 2 , lithium niobiate (LiNbO 3 ) 3 , zinc oxide (ZnO) 4 , aluminium nitride (AlN) 5 , hafnium oxide (HfO 2 ) 6 , yttrium barium copper oxide (YBCO) 7,8 . The latter compound, YBa 2 Cu 3 O 6+x , is well-known as a high critical temperature superconductor, for oxygen doping x above ~ 0.5.…”

Section: Introductionmentioning

confidence: 99%

Mixed oxide provides an efficient solution to near infrared detection

Cheneau,

Dégardin,

Kreisler

2023

Electro-Optical and Infrared Systems: Technology and Applications XX

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With the objective of producing high-performance infrared radiation detectors, we have undertaken the study of devices based on the Y-Ba-Cu-O material produced in amorphous film (a-YBCO) by DC sputtering at low temperature (< 150 °C) on p-doped silicon substrates coated with a SiO x oxide film. Two types of structures have been considered: simple planar structures, where a-YBCO is connected to in-plane metal contacts, and trilayer structures where a-YBCO is sandwiched between the two contacts. The near-infrared response was recorded with a laser source at 850 nm wavelength, amplitude modulated up to 40 MHz. The main characteristics of the responses are: i) a 𝑓𝑓 +2 behavior at very low frequency (resulting from two dipolar relaxations); ii) a typically pyroelectric behavior in 𝑓𝑓 +1 up to a few tens of kHz; iii) a maximum response followed by a decrease in 𝑓𝑓 −1/2 , reflecting the heat diffusion through the substrate. All of those results could be interpreted with the help of a theoretical model with adjustable parameters. Small size trilayer devices exhibit a very fast response (time constant: 11 ns). Besides, with noise equivalent power levels as low as 8 pW/Hz 1/2 and detectivity values of 8×10 8 cm⋅Hz 1/2 •W −1 at 1 MHz, our uncooled devices are standing at the state-of-the-art both in terms of sensitivity and bandwidth.

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“…At the core of the uncooled thermal detector development is the material choice for sensing the incoming radiation. Various materials have been used for developing thin-film pyroelectric detectors [ 9 ]: e.g., P(VDF-TrF) copolymers [ 10 ], lead zirconate titanate (PbZrTiO 3 or PZT) [ 11 ], lithium tantalate (LiTaO 3 ) [ 12 ], and lithium niobate (LiNbO 3 ) [ 13 ], with good performances. For instance, the LiTaO 3 sensor published in [ 12 ] exhibited a good detectivity value

1.7 × 10 8 cm·Hz 1/2 ·W −1 at 80 Hz but a slow response (thermal time constant

5.8 ms).…”

Section: Introductionmentioning

confidence: 99%

Fast and Uncooled Semiconducting Ca-Doped Y-Ba-Cu-O Thin Film-Based Thermal Sensors for Infrared

Dégardin,

Alamarguy,

Brézard Oudot

et al. 2023

Sensors

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YBa2Cu3O6+x (YBCO) cuprates are semiconductive when oxygen depleted (x < 0.5). They can be used for uncooled thermal detection in the near-infrared: (i) low temperature deposition on silicon substrates, leading to an amorphous phase (a-YBCO); (ii) pyroelectric properties exploited in thermal detectors offering both low noise and fast response above 1 MHz. However, a-YBCO films exhibit a small direct current (DC) electrical conductivity, with strong non-linearity of current–voltage plots. Calcium doping is well known for improving the transport properties of oxygen-rich YBCO films (x > 0.7). In this paper, we consider the performances of pyroelectric detectors made from calcium-doped (10 at. %) and undoped a-YBCO films. First, the surface microstructure, composition, and DC electrical properties of a-Y0.9Ca0.1Ba2Cu3O6+x films were investigated; then devices were tested at 850 nm wavelength and results were analyzed with an analytical model. A lower DC conductivity was measured for the calcium-doped material, which exhibited a slightly rougher surface, with copper-rich precipitates. The calcium-doped device exhibited a higher specific detectivity (D*=7.5×107 cm·Hz/W at 100 kHz) than the undoped device. Moreover, a shorter thermal time constant (<8 ns) was inferred as compared to the undoped device and commercially available pyroelectric sensors, thus paving the way to significant improvements for fast infrared imaging applications.

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Modified lead titanate thin films for pyroelectric infrared detectors on gold electrodes

Cited by 6 publications

References 24 publications

Electro-Optical Properties of Sputtered Calcium Lead Titanate Thin Films for Pyroelectric Detection

Electro-Optical Properties of Sputtered Calcium Lead Titanate Thin Films for Pyroelectric Detection

Mixed oxide provides an efficient solution to near infrared detection

Fast and Uncooled Semiconducting Ca-Doped Y-Ba-Cu-O Thin Film-Based Thermal Sensors for Infrared

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