Low temperature thermoelectric properties of Bi2−xSbxTeSe2 crystals near the n-p crossover

► We report thermoelectric properties of Bi2−xSbxTeSe2 (x=0.8, 0.9, 1.0, 1.1, and 1.2). ► Higher Sb content leads to a change from n- to p-type between x=1.0 and 1.1. ► Thermoelectric efficiency ZT is maximized near the n-p crossover (x=1.1).