Recent Advances in Touch Sensors for Flexible Displays

Ouyang, Chenglan; Liu, Di; He, Kan; Kang, Jiahao

doi:10.1109/ojnano.2022.3224757

Cited by 2 publications

(1 citation statement)

References 69 publications

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“…Transparent conducting oxides, especially indium tin oxide (ITO), have been extensively used as electrodes in applications that require transparency in the visible region of the electromagnetic spectrum. These applications range from touch screen panels 1 to solar cells 2 and have become integral to many popular technologies used today. While ITO is typically deposited onto rigid substrates such as glass, ITO-coated plastics (such as polyethylene terephthalate (PET)) are also commercially available.…”

Section: Introductionmentioning

confidence: 99%

Maintaining Electrochemical Performance of Flexible ITO-PET Electrodes under High Strain

Waldman,

Haunert,

Carson

et al. 2024

ACS Omega

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Flexible electrode materials, particularly indium tin oxide (ITO)coated polyethylene terephthalate (PET), have attracted the attention of researchers for a wide variety of applications. However, there has been limited attention to the effects of electrode flexibility during electrochemical processes. In this research article, we studied how bending commercially available ITO-PET electrodes impacts the electrodeposition process of polyaniline (PANI). Thicker ITO layers start cracking at a normalized strain of 0.10 (bending radius of 10 mm), and cracking becomes detrimental to full deposition at a normalized strain of 0.16 or higher (bending radius of 6 mm or lower). Thinner ITO layers were evaluated as electrodes in electrochemical applications; however, the higher resistance of these electrodes prevented uniform electrodeposition of PANI. In order to overcome the issues of cracking, conductive thin films and copper tape were explored as low-cost methods for electrically bridging cracks in the electrode. While conductive thin films reduced the resistance effect, copper tape was found to fully restore the original electrochemical activity as measured by chronoamperometry and enable uniform electrodeposition at a bending radius as low as 3 mm. This strategy was then demonstrated by performing electrochromic bleaching of PANI under high-strain conditions. These studies illustrate some of the limitations of ITO-PET electrodes and strategies for overcoming these limitations for future applications that require a high degree of flexibility in a transparent electrode substrate.

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Section: Introductionmentioning

confidence: 99%