Low Thermal Conductivity and High Thermoelectric Performance of Kagome‐Like As and Sb Monolayers: A First‐Principles Study

The thermoelectric (TE) properties of the newly proposed Kagome‐like arsenene (Kagome–As) and antimonene (Kagome–Sb) 2D materials are studied by first‐principles method and Boltzmann transport theory. Kagome–As and Kagome–Sb monolayers are found to exhibit large power factor (PF) due to the large Seebeck coefficient and high electrical conductivity. Meanwhile, the Kagome–As and Kagome–Sb have low thermal conductivity of 2.97 and 0.94 W m−1 K−1 at 300 K, respectively. Combined excellent PF and suppressed thermal conductivity, the Kagome–As and Kagome–Sb are expected to have good TE performance with the maximal ZT values reaching up to 0.66 and 2.52 at 300 K, respectively. The Kagome‐like group‐V elemental monolayers are promising TE candidates and shed light on the theoretical design of high‐performance 2D materials, which are demonstrated in the results.