Oxide-Metal-Oxide Layers for Flexible and See-Through Electronics

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Transparent electrode (TE) is a key component in many modern electronic devices. While it has been heavily dominated by indium tin oxides (ITOs), various process- or material-related constraints in next-generation devices such as flexible displays and see-through electronic devices often require an alternative TE technology to be developed. In general, transparent electrodes to be used with these emerging devices should fulfill the following requirements: (i) their sheet resistance should be as low as possible; (ii) TEs themselves should be compatible with pre- or post-processing used during the fabrication of devices of interest; (iii) their deposition should be mild enough not to damage layers underneath; and (iv) for flexible devices, TEs should also possess an excellent flexibility with sufficiently high onset strain for bending-induced crack formation. In fact, one of the major reasons to develop ITO-alternatives is because ITO forms crack at a relatively low strain (typically around 1.5% or less). In addition, TEs should be able to provide optical properties required by a given application. In many cases, high transmittance is generally desired; in case of light-emitting or photovoltaic devices, however, a certain range of reflectance (at the expense of transmittance) may be preferred for a cavity resonance effect for wide color gamut or for efficiency enhancement. Therefore, ability to tune transmittance (reflectance) in a wide range could be highly useful to cope with desired specifications of various applications. In this talk, oxide-metal-oxide (OMO) or dielectric-metal-dielectric (DMD) layers are introduced as a versatile TE that can fulfill all the requirements mentioned above and, moreover, can easily tune its transmittance/ reflectance for the required optical characteristics. Highly flexible organic light-emitting diodes (OLEDs), transparent thin-film transistors, efficient see-through solar cells are introduced as representative examples. Subtle but significant effect of the refractive index of oxide layers is also discussed to reveal its versatile potential.
Publisher
Material Research Society
Issue Date
2016-03-30
Language
English
Citation

MRS Spring Meeting

URI
http://hdl.handle.net/10203/218911
Appears in Collection
EE-Conference Papers(학술회의논문)
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