Absolute Seebeck coefficient of thin platinum films

Kockert, M.; Mitdank, R.; Zykov, Anton; Kowarik, Stefan; Fischer, Saskia F.

doi:10.1063/1.5101028

Cited by 30 publications

(42 citation statements)

References 35 publications

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“…Hence, optical absorption affects conductivity, which is a considerably stronger effect than the Seebeck mechanism, which generates low photo-voltage ∆V = S∇T even for the large Seebeck constant S of graphene [36]. The gradient thickness of metal contact used in this study can be also useful for measurement of the Seebeck constant of metal nanofilms, where it depends on the mean free path of electrons and phonon drag [37,38], and has to be experimentally determined for precise temperature measurements at the nanoscale [39].…”

Section: Photodetector For a Small Detection Areamentioning

confidence: 98%

Optically-Thin Broadband Graphene-Membrane Photodetector

et al. 2020

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A broadband graphene-on-Si3N4-membrane photodetector for the visible-IR spectral range is realised by simple lithography and deposition techniques. Photo-current is produced upon illumination due to presence of the build-in potential between dissimilar metal electrodes on graphene as a result of charge transfer. The sensitivity of the photo-detector is ∼1.1 μA/W when irradiated with 515 and 1030 nm wavelengths; a smaller separation between the metal contacts favors gradient formation of the built-in electric field and increases the efficiency of charge separation. This optically-thin graphene-on-membrane photodetector and its interdigitated counterpart has the potential to be used within 3D optical elements, such as photonic crystals, sensors, and wearable electronics applications where there is a need to minimise optical losses introduced by the detector.

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Section: Photodetector For a Small Detection Areamentioning

confidence: 98%

Optically-Thin Broadband Graphene-Membrane Photodetector

et al. 2020

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“…In order to obtain the absolute Seebeck coefficient of a silver nanowire, which is given bythe absolute Seebeck coefficient of the platinum conduction line is required. was determined in a separate experiment 10 by measuring a bulk gold wire with known absolute Seebeck coefficient relative to the thin platinum conduction line. See also Supplementary Information S3.…”

Section: Resultsmentioning

confidence: 99%

“…See also Supplementary Information S3. A detailed discussion of the absolute Seebeck coefficient of thin platinum films and the effects of heat treatment on the transport properties is given in reference 10 . The relative and absolute Seebeck coefficients of the reference platinum film are given in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…A small absolute Seebeck coefficient is important for interconnects in low-noise electronics. While the thermoelectric properties of metallic thin films have been studied 5,10–16 , it is very challenging to determine these of individual metallic nanowires 17–21 .…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the determination of the absolute Seebeck coefficient of an individual metallic nanowire requires the knowledge of the absolute Seebeck coefficient of the micro- and nanopatterned thermoelectric reference material. For such, it has been shown that the Seebeck coefficient is size-dependent 10–12 .…”

Section: Introductionmentioning

confidence: 99%

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Nanometrology: Absolute Seebeck coefficient of individual silver nanowires

Kockert

Kojda

Mitdank

et al. 2019

Sci Rep

Self Cite

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Thermoelectric phenomena can be strongly modified in nanomaterials. The determination of the absolute Seebeck coefficient is a major challenge for metrology with respect to micro- and nanostructures due to the fact that the transport properties of the bulk material are no more valid. Here, we demonstrate a method to determine the absolute Seebeck coefficient S of individual metallic nanowires. For highly pure and single crystalline silver nanowires, we show the influence of nanopatterning on S in the temperature range between 16 K and 300 K. At room temperature, a nanowire diameter below 200 nm suppresses S by 50% compared to the bulk material to less than S = 1 μVK−1, which is attributed to the reduced electron mean free path. The temperature dependence of the absolute Seebeck coefficient depends on size effects. Thermodiffusion and phonon drag are reduced with respect to the bulk material and the ratio of electron-phonon to phonon-phonon interaction is significantly increased.

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Electrode‐Dependent and Tunable Sub‐to‐Super‐Linear Responsivity in Mott Material‐Enabled Near‐Infrared Photodetectors for Advanced Near‐Sensor Image Processing

Li,

Xie,

Chen

et al. 2024

Advanced Materials

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Brain‐like intelligence is ushering humanity into an era of the Internet of Perceptions (IoP), where the vast amounts of data generated by numerous sensing nodes pose significant challenges to transmission bandwidth and computing hardware. A recently proposed near‐sensor computing architecture offers an effective solution to reduce data processing delays and energy consumption. However, a pressing need remains for innovative hardware with multifunctional near‐sensor image processing capabilities. In this work, Mott material (vanadium dioxide)‐based photothermoelectric near‐infrared photodetectors are developed that exhibit electrode‐dependent and tunable super‐linear photoresponse (exponent α > 33) with ultralow modulation bias. These devices demonstrate an opto‐thermo‐electro‐coupled phase transition, resulting in a large photocurrent on/off ratio (>105), high responsivity (≈500 A W−1), and well detectivity (≈3.9 × 1012 Jones), all while maintaining rapid response speeds (τr = 2 µs and τd = 5 µs) under the bias of 1 V. This electrode‐dependent super‐linear response is found to arise from the electron doping effect determined by the polarity of the Seebeck coefficient. Furthermore, the work showcases intensity‐selective near‐sensor processing and night vision pattern reorganization, even with noisy inputs. This work paves the way for developing near‐sensor devices with potential applications in medical image preprocessing, flexible electronics, and intelligent edge sensing.

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Absolute Seebeck coefficient of thin platinum films

Cited by 30 publications

References 35 publications

Optically-Thin Broadband Graphene-Membrane Photodetector

Optically-Thin Broadband Graphene-Membrane Photodetector

Nanometrology: Absolute Seebeck coefficient of individual silver nanowires

Electrode‐Dependent and Tunable Sub‐to‐Super‐Linear Responsivity in Mott Material‐Enabled Near‐Infrared Photodetectors for Advanced Near‐Sensor Image Processing

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