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Transparent conducting oxides (TCOs) are essential components ofoptoelectronic devices and various materials have been explored for highlyefficient TCOs having a combination of high transmittance and low sheetresistance. Here, we focus on a misfit thermoelectric oxide[Ca$_2$CoO$_3$]$_{0.62}$[CoO$_2$] and fabricate the transparent low-layeredcrystals by a mechanical tape-peeling method using the single-crystallinesamples. From the transmittance measurement, we find that the thickness oflow-layered samples is several orders of hundred nanometers, which iscomparable with the estimation from the scanning electron microscopy images.Compared to the previous results on the polycrystalline and $c$-axis orientedtransparent films, the electrical resistivity is reduced owing to thesingle-crystalline nature. The figure of merit for the transparent conductingmaterials in the present low-layered samples is then evaluated to be higherthan the values in the previous reports. The present results on the low-layeredsingle-crystalline [Ca$_2$CoO$_3$]$_{0.62}$[CoO$_2$] may offer a unique classof multi-functional transparent thermoelectric oxides.

Mechanically exfoliated low-layered [Ca$_2$CoO$_3$]$_{0.62}$[CoO$_2$]: A single-crystalline p-type transparent conducting oxide