Guangxi Key Laboratory of Information Materials, Engineering Research Center of Electronic Information Materials and Devices, Ministry of Education, School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China.
School of Chemistry and Chemical Engineering and School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China.
Sci Adv. 2023 Apr 28;9(17):eadh0713. doi: 10.1126/sciadv.adh0713. Epub 2023 Apr 26.
By the fine manipulation of the exceptional long-range germanium-telluride (Ge─Te) bonding through charge transfer engineering, we have achieved exceptional thermoelectric (TE) and mechanical properties in lead-free GeTe. This chemical bonding mechanism along with a semiordered zigzag nanostructure generates a notable increase of the average to a record value of ~1.73 in the temperature range of 323 to 773 K with ultrahigh maximum ~ 2.7. In addition, we significantly enhanced the Vickers microhardness numbers () to an extraordinarily high value of 247 and effectively eliminated the thermal expansion fluctuation at the phase transition, which was problematic for application, by the present charge transfer engineering process and concomitant formation of microstructures. We further fabricated a single-leg TE generator and obtained a conversion efficiency of ~13.4% at the temperature difference of 463 K on a commercial instrument, which is located at the pinnacle of TE conversion.
通过电荷转移工程对超长距离锗碲（Ge─Te）键的精细操控，我们在无铅 GeTe 中实现了卓越的热电（TE）和机械性能。这种化学键合机制与半有序之字形纳米结构相结合，在 323 至 773 K 的温度范围内，平均值显著增加到创纪录的1.73，超高最大值2.7。此外，我们通过当前的电荷转移工程过程和伴随的微观结构形成，将维氏显微硬度值（）显著提高到 247 的极高值，并有效消除了相变时热膨胀的波动，这在应用中是一个问题。我们进一步制造了一个单腿 TE 发电机，并在商业仪器上获得了 463 K 温差下约 13.4%的转换效率，这处于 TE 转换的巅峰。
