Thickness‐Dependent In‐Plane Thermal Conductivity and Enhanced Thermoelectric Performance in p‐Type ZrTe 5 Nanoribbons

Topological materials attract enormous attention due to their unique physical properties and thermoelectric applications. ZrTe 5 , a semimetal material, is proposed to be a new topological material and shows interesting thickness‐dependent electrical transport properties. Here, the in‐plane thermal conductivity and power factor in exfoliated few‐layer ZrTe 5 nanoribbons with different thickness measured using suspended thermal bridge method are reported. A nearly linearly thickness‐dependent thermal conductivity κ is observed where thicker nanoribbons present higher thermal conductivity in the temperature range of 100–300 K due to phonon‐boundary scattering. More interestingly, the room temperature figure of merit ZT of 140 nm‐thick ZrTe 5 nanoribbon is five times higher than that in bulk ZrTe 5 , providing superior thermoelectric performance in thinner ZrTe 5 nanoribbons and revealing the promising prospect of ZrTe 5 nanoribbons as thermoelectric materials.