<p>➀ Queensland University of Technology researchers developed a copper-ion doping method for germanium telluride, improving thermoelectric efficiency by over 50%;</p><p>➁ The technique achieved a record figure of merit (ZT) of 2.3 through precise copper substitution in crystal lattices, enhancing waste-heat-to-electricity conversion;</p><p>➂ This breakthrough enables more efficient energy harvesting for applications like low-power electronics and industrial heat recovery.</p>