Thermoelectric technology has been widely used for key areas, including waste-heat recovery and solid-state cooling. We discovered tin selenide (SnSe) crystals with potential power generation and Peltier cooling performance. The extensive off-stoichiometric defects have a larger impact on the transport properties of SnSe, which motivated us to develop a lattice plainification strategy for defects engineering. We demonstrated that Cu can fill Sn vacancies to weaken defects scattering and boost carrier mobility, facilitating a power factor exceeding ~100 microwatts per centimeter per square kelvin and a dimensionless figure of merit ( ZT ) of ~1.5 at 300 kelvin, with an average ZT of ~2.2 at 300 to 773 kelvin. We further realized a single-leg efficiency of ~12.2% under a temperature difference (Δ T ) of ~300 kelvin and a seven-pair Peltier cooling Δ T max of ~61.2 kelvin at ambient temperature. Our observations are important for practical applications of SnSe crystals in power generation as well as electronic cooling.

中文翻译：

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晶格平整化推进高效 SnSe 晶体热电

热电技术已广泛应用于余热回收和固态冷却等重点领域。我们发现了具有潜在发电和帕尔帖冷却性能的硒化锡 (SnSe) 晶体。广泛的非化学计量缺陷对 SnSe 的传输特性有更大的影响，这促使我们为缺陷工程开发晶格平整策略。我们证明了 Cu 可以填充 Sn 空位以削弱缺陷散射并提高载流子迁移率，促进功率因数超过每平方开尔文每厘米 100 微瓦和无量纲品质因数（中通) 在 300 开尔文时约为 1.5，平均中通在 300 至 773 开尔文时约为 2.2。我们进一步实现了在温差（Δ吨) ~300 开尔文和七对珀耳帖冷却 Δ吨 最大限度在环境温度下为 ~61.2 开尔文。我们的观察对于 SnSe 晶体在发电和电子冷却中的实际应用非常重要。