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Transparent Pressure Sensor with High Linearity over a Wide Pressure Range for 3D Touch Screen Applications
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    Transparent Pressure Sensor with High Linearity over a Wide Pressure Range for 3D Touch Screen Applications
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    • Han Byul Choi
      Han Byul Choi
      Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
    • Jinwon Oh
      Jinwon Oh
      Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
      More by Jinwon Oh
    • Youngsoo Kim
      Youngsoo Kim
      Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
      More by Youngsoo Kim
    • Mikhail Pyatykh
      Mikhail Pyatykh
      Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
    • Jun Chang Yang
      Jun Chang Yang
      Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
    • Seunghwa Ryu
      Seunghwa Ryu
      Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
      More by Seunghwa Ryu
    • Steve Park*
      Steve Park
      Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
      *E-mail: [email protected]
      More by Steve Park
    Other Access OptionsSupporting Information (1)

    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2020, 12, 14, 16691–16699
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    https://doi.org/10.1021/acsami.0c00267
    Published March 17, 2020
    Copyright © 2020 American Chemical Society

    Abstract

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    The demand for display technology is expected to increase with the continuous spread of portable electronics and with the expected emergence of flexible, wearable, and transparent display devices. A touch screen is a critical component in display technology that enables user interface operations, and the future generation of touch screens, the so-called 3D touch screens, is expected to be able to detect multiple levels of pressure. To enable 3D touch screens, transparent pressure sensors with high linearity over a working range that encompasses the pressure range of human touch (10–100 kPa) are required. In this work, a transparent and linear capacitive pressure sensor is reported with a transmittance over 85% and high linearity (R2 = 0.995) over 5–100 kPa of pressure. To render the sensor transparent, a microstructured “hard” elastomer layer was filled in with a refractive index matching a “soft” elastomer layer, through which light scattering was minimized. High linearity was attained from the sensor’s unique architecture that increases the effective area of the capacitor with applied pressure. These attributes render our sensor highly suitable for future 3D touch screen applications.

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsami.0c00267.

    • Comparison of TLPS with previously researched pressure sensors; sensors’ relative capacitance change with various block positions on the sensor array; compressive stress (pressure) versus compressive strain curves of hard and soft PDMS film; transmittance curves and optical photograph of TLPS with different thicknesses of PEDOT:PSS layer; simulation of transmittance versus wavelength plots; SEM images of pyramids with different spacing; transmittance versus wavelength curves for sensors with different structures and pyramid densities; linearity and sensitivity of pyramid PDMS sensors with different spacing between pyramids and of bare PDMS sensor in the highly sensitive and saturated pressure regions; rescaled plot of sensitivity for the bare PDMS sensor; relative capacitance change versus pressure of TLPS, pyramid PDMS, samples with different thickness of soft PDMS layer, and sensors with different curing agent ratio for the soft PDMS layer; compressive strain simulation results of TLPS and pyramid PDMS; geometrical details and analytical expression for the linear capacitance change versus pressure; linearity and sensitivity of TLPS with different spacing between pyramids; and response of TLPS arrays to high pressure levels (PDF)

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    This article is cited by 63 publications.

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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2020, 12, 14, 16691–16699
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsami.0c00267
    Published March 17, 2020
    Copyright © 2020 American Chemical Society

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