Yun‐Han Huang LuI‐Lun JenChing‐Yu ChiangWan‐Zhen HsiehGung‐Chian YinYen‐Fang SongHSIN-JAY WU2025-03-072025-03-072025-01-07https://www.scopus.com/record/display.uri?eid=2-s2.0-85214406085&origin=resultslisthttps://scholars.lib.ntu.edu.tw/handle/123456789/725554Silver chalcogenides exhibit exceptional transport properties but face structural instability at high temperatures, limiting their practical applications. Using Ag2Te as a model, it is confirm that silver whisker growth above the phase transition renders Ag2Te unsuitable for thermoelectric applications. Here, the whisker growth mechanism is investigated and propose an inhibition strategy, overcoming a major obstacle in using silver chalcogenides. The presence of highly mobile Ag and lattice strain cause by phase transition are two factors leading to the formation of silver whiskers. Adding a trace amount of Ga inhibits silver whisker growth by forming an immobile Ag-Ga solid-solution phase and optimizing thermoelectric performance simultaneously. Consequently, a single leg of Ga-Ag2Te achieves a conversion efficiency of 2.3% with a ΔT of 300 K and remains whisker-free after high-temperature testing. A thermally robust, high-performance thermoelectric single leg based on liquid-like silver chalcogenides is successfully developed.cationic doping stabilizationsilver whiskersliver chalcogenidesthermoelectric performance[SDGs]SDG7journal article10.1002/smll.202410583