Tin selenite (SnSe) has attracted significant attention due to its record thermoelectric figure of merit (ZT=2.6 at 923 K) of its single crystal. However, the polycrystalline SnSe processes considerably less ZTs (1.1). In this study, we investigate the thermoelectric properties of Ag-doped polycrystalline SnSe, which was synthesized via zone melting and hot pressing. By comparing our results and previous reports of Ag-doped single crystals and polycrystals, we determine that the high texturing degree is essential for achieving good thermoelectric performance in polycrystalline SnSe. The zone-melted Sn_0.99Ag_0.02Se shows better thermoelectric performance than the Ag-doped SnSe single crystal in the entire temperature range, exhibiting a peak ZT of 1.3 at 793 K.

亚硒酸锡（SnSe）由于其单晶的创纪录的热电性能因数（923 K时ZT = 2.6 ）而备受关注。但是，多晶SnSe处理的ZT少得多（1.1）。在这项研究中，我们研究了通过区域熔化和热压合成的Ag掺杂多晶SnSe的热电性能。通过比较我们的结果和先前的Ag掺杂单晶和多晶报告，我们确定高织构度对于在多晶SnSe中获得良好的热电性能至关重要。在整个温度范围内，区域熔化的Sn _0.99 Ag _0.02 Se表现出比掺杂Ag的SnSe单晶更好的热电性能，并表现出ZT峰值 在793 K时为1.3