High Thermoelectric and Reversible p-n-p Conduction Type Switching Integrated in Dimetal Chalcogenide

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• 作者：Chong Xiao ; Xinming Qin ; Jie Zhang ; Ran An ; Jie Xu ; Kun Li ; Boxiao Cao ; Jinlong Yang ; Bangjiao Ye ; Yi Xie
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：November 7, 2012
• 年：2012
• 卷：134
• 期：44
• 页码：18460-18466
• 全文大小：515K
• 年卷期：v.134,no.44(November 7, 2012)
• ISSN：1520-5126

文摘

The subject of the involved phase transition in solid materials has formed not only the basis of materials technology but also the central issue of solid-state chemistry for centuries. The ability to design and control the required changes in physical properties within phase transition becomes key prerequisite for the modern functionalized materials. Herein, we have experimentally achieved the high thermoelectric performance (ZT value reaches 1.5 at 700 K) and reversible p-n-p semiconducting switching integrated in a dimetal chalcogenide, AgBiSe₂ during the continuous hexagonal鈥搑hombohedral鈥揷ubic phase transition. The clear-cut evidences in temperature-dependent positron annihilation and Raman spectra confirmed that the p-n-p switching is derived from the bimetal atoms exchange within phase transition, whereas the full disordering of bimetal atoms after the bimetal exchange results in the high thermoelectric performance. The combination of p-n-p switching and high thermoelectric performance enables the dimetal chalcogenides perfect candidates for novel multifunctional electronic devices. The discovery of bimetal atoms exchange during the phase transition brings novel phenomena with unusual properties which definitely enrich solid-state chemistry and materials science.