Microstructurally Tailored Thin β-Ag2Se Films toward Commercial Flexible Thermoelectrics

作者：Lei, Yan^*; Qi, Ruijuan; Chen, Miaoying; Chen, Hong; Xing, Chengcheng; Sui, Fengrui; Gu, Longyan; He, Weiwei; Zhang, Yange; Baba, Takahiro; Baba, Tetsuya; Lin, Hong; Mori, Takao^*; Koumoto, Kunihito; Lin, Yuan; Zheng, Zhi^*

来源：Advanced Materials, 2022, 34(7): 2104786.

DOI：10.1002/adma.202104786

• Ag
• Se-2
• aqueous selenization reaction
• flexible thermoelectric power generators
• maximum output power density
• thin films

Aiming to overcome both the structural and commercial limitations of flexible thermoelectric power generators, an efficient room-temperature aqueous selenization reaction that can be completed in air within less than 1 min, to directly fabricate thin beta-Ag2Se films consisting of perfectly crystalline and large columnar grains with both in-plane randomness and out-of-plane [201] preferred orientation, is designed. A high power factor (PF) of 2590 +/- 414 mu W m(-1) K-2 and a figure-of-merit (zT) of 1.2 +/- 0.42 are obtained from a sample with a thickness of approximate to 1 mu m. The maximum output power density of the best 4-leg thermoelectric generator sample reach 27.6 +/- 1.95 and 124 +/- 8.78 W m(-2) at room temperature with 30 and 60 K temperature differences, respectively, which may be useful in future flexible thermoelectric devices.

• 单位
  1; 中国科学院; 中国科学院研究生院; y; 清华大学