Two-dimensional SnP2Se6 with gate-tunable Seebeck coefficient for telecommunication band photothermoelectric detection

IF 22.7 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Infomat Pub Date : 2024-07-15 DOI:10.1002/inf2.12600
Bing-Xuan Zhu, Cheng-Yi Zhu, Jing-Kai Qin, Wen He, Lin-Qing Yue, Pei-Yu Huang, Dong Li, Ruo-Yao Sun, Sheng Ye, Yu Du, Jie-He Sui, Ming-Yu Li, Jun Mao, Liang Zhen, Cheng-Yan Xu
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Abstract

Photothermoelectric (PTE) detectors combine photothermal and thermoelectric conversion, surmounting material band gap restrictions and limitations related to matching light wavelengths, have been widely used in telecommunication band detection. Two-dimensional (2D) materials with gate-tunable Seebeck coefficient can induce the generation of photothermal currents under illumination by the asymmetric Seebeck coefficient, making them promising candidate for PTE detectors in the telecommunication band. In this work, we report that a newly explored van der Waals (vdW) layered material, SnP2Se6, possessing excellent field regulation capabilities and behaviors as an ideal candidate for PTE detector implementation. With the assistance of temperature-dependent Raman characterization, the suspended atomic thin SnP2Se6 nanosheets reveal thickness-dependent thermal conductivity of 1.4–5.7 W m−1 K−1 at room temperature. The 2D SnP2Se6 demonstrates high Seebeck coefficient (S) and power factor (PF), which are estimated to be −506 μV K−1 and 207 μW m−1 K−2, respectively. By effectively modulating the SnP2Se6 localized carrier concentration, which in turn leads to inhomogeneous Seebeck coefficients, the designed dual-gate PTE detector with 2D SnP2Se6 channel demonstrates wide spectral photoresponse in telecommunication bands, yielding high responsivity (R = 1.2 mA W−1) and detectivity (D* = 6 × 109 Jones) under 1550 nm light illumination. Our findings provide a new material platform and device configuration for the telecommunication band detection.

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具有栅极可调塞贝克系数的二维 SnP2Se6,用于电信波段光热电探测
光热电(PTE)探测器结合了光热转换和热电转换,克服了材料带隙限制和与光波长匹配相关的限制,已广泛应用于电信波段探测。具有栅极可调塞贝克系数的二维(2D)材料在光照下可通过非对称塞贝克系数诱导产生光热电流,因此有望成为电信波段 PTE 探测器的候选材料。在这项工作中,我们报告了一种新发现的范德华(vdW)层状材料 SnP2Se6,它具有出色的场调节能力和行为,是实现 PTE 探测器的理想候选材料。在随温度变化的拉曼特性分析的帮助下,悬浮的原子薄 SnP2Se6 纳米片在室温下显示出 1.4-5.7 W m-1 K-1 的随厚度变化的热导率。二维 SnP2Se6 具有很高的塞贝克系数(S)和功率因数(PF),估计分别为 -506 μV K-1 和 207 μW m-1 K-2。通过有效调节 SnP2Se6 局域载流子浓度(这反过来又会导致不均匀塞贝克系数),所设计的具有二维 SnP2Se6 沟道的双栅 PTE 探测器在 1550 纳米光照下显示出电信波段的宽光谱光响应,产生了高响应率(R = 1.2 mA W-1)和探测率(D* = 6 × 109 Jones)。我们的研究结果为电信波段探测提供了一种新的材料平台和器件配置。
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来源期刊
Infomat
Infomat MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
37.70
自引率
3.10%
发文量
111
审稿时长
8 weeks
期刊介绍: InfoMat, an interdisciplinary and open-access journal, caters to the growing scientific interest in novel materials with unique electrical, optical, and magnetic properties, focusing on their applications in the rapid advancement of information technology. The journal serves as a high-quality platform for researchers across diverse scientific areas to share their findings, critical opinions, and foster collaboration between the materials science and information technology communities.
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