Optimization of photo-thermoelectric performance in SnSe crystals via doping engineering

被引：6
作者：
Chen, Li-Da [1 ,2 ,3 ]
Jiang, Hong-Tao [3 ,4 ]
Yin, Cheng-Hao [3 ,4 ]
Zhang, En-Rui [5 ]
Hou, Yue-Ying [1 ,2 ,3 ]
Zhou, Xiao-Li [1 ,2 ,3 ]
Wang, Fan [3 ,4 ]
Lv, Yang-Yang [3 ,4 ]
Yan, Xue-Jun [1 ,2 ,3 ]
Zhou, Jian [1 ,2 ,3 ]
Yao, Shu-Hua [1 ,2 ,3 ,6 ]
Chen, Y. B. [3 ,4 ]
Lu, Ming-Hui [1 ,2 ,3 ]
Chen, Yan-Feng [1 ,2 ,3 ,7 ]
机构：
[1] Nanjing Univ, Jiangsu Key Lab Artificial Funct Mat, Nanjing 210093, Peoples R China
[2] Nanjing Univ, Dept Mat Sci & Engn, Nanjing 210093, Peoples R China
[3] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
[4] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China
[5] Natl Univ Def Technol, Dept Phys, Changsha 410073, Hunan, Peoples R China
[6] Wuhan Inst Technol, Hubei Key Lab Plasma Chem & Adv Mat, Wuhan 430205, Peoples R China
[7] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2023年 / 123卷 / 04期
基金：
中国国家自然科学基金;
关键词：
TEMPERATURE TERAHERTZ DETECTION; FIGURE; MERIT;
D O I：
10.1063/5.0153494
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Thermoelectric materials, based on photo-thermoelectric effect (PTE), may be promising in photo-detection because of their self-power, extremely broad-band, and free of cryogenic attachments. Up to now, the performance of PTE is mainly optimized through enhancement of extrinsic absorption such as using optical metamaterials. Instead, we here improve the PTE through materials engineering, accordingly systematically investigated the PTE of both P- and N-type SnSe crystals with different carrier concentrations (10(17)-10(19) cm(-3)). P-type SnSe has much better photo-thermoelectric performance than the N-type one. Among P-type SnSe, the SnSe crystal with the largest carrier concentration (& SIM;10(19) cm(-3) at room temperature) demonstrates the highest photo-thermoelectric performance. Analysis by a modified two-temperature model suggests that the key parameter of enhanced PTE is the high electrical conductivity, which leads to large optical absorption and large temperature difference. Our work provides a guideline on how to engineer thermoelectric materials to enhance their photo-thermoelectric performance.
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页数：6
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