Enhanced figure of merit of polycrystalline PtSe2/PtSe2 structures at room temperature by a facile wet-transfer stacking method

IF 0.8 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
Jung-Min Cho, Yun-Ho Kim, Won-Yong Lee, Jae Won Choi, No-Won Park, Sree Sourav Das, Mona Zebarjadi, Gil-Sung Kim, Sang-Kwon Lee
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Abstract

We report a promising strategy to enhance the in-plane thermoelectric (TE) figure of merit (ZT) of few-layer semimetallic PtSe2 films at 300 K by piling up PtSe2 layers with the same thickness (3 nm) as stacked PtSe2/PtSe2 (3-nm/3-nm) homostructures by a wet-transfer method. We observed that the Seebeck coefficient was enhanced meaningfully upon increasing the number of stacked layers and exceeded ~ 173.2 μV/K with a relatively constant electrical conductivity of ~ 18.4 S/cm at 300 K. By contrast, as the number of layers increased, thermal conductivity also showed a significant reduction, and ultimately, the ZT factor increased by ~ 380% compared to the single-stacked PtSe2 structure. Such an increase in the ZT factor shows the possibility of a considerable improvement in the TE properties of semimetallic PtSe2 with a new technique called facile wet-transfer stacking. The proposed method is expected to play a very important role in future microscopic cooling and energy-generating TE device applications.

Abstract Image

通过简便的湿转移堆叠法提高室温下多晶 PtSe2/PtSe2 结构的优越性能
我们报告了一种很有前途的策略,即通过湿转移法堆叠与堆叠 PtSe2/PtSe2 (3-nm/3-nm) 均质结构相同厚度(3 nm)的 PtSe2 层,从而在 300 K 温度下提高少层半金属 PtSe2 薄膜的面内热电 (TE) 优越性 (ZT)。我们观察到,随着堆叠层数的增加,塞贝克系数显著提高,在 300 K 时超过了 ~ 173.2 μV/K,电导率相对恒定,为 ~ 18.4 S/cm。ZT 系数的增加表明,采用一种名为 "便捷湿转移堆叠 "的新技术,半金属 PtSe2 的 TE 特性有可能得到显著改善。所提出的方法有望在未来的微观冷却和发电 TE 器件应用中发挥非常重要的作用。
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来源期刊
Journal of the Korean Physical Society
Journal of the Korean Physical Society PHYSICS, MULTIDISCIPLINARY-
CiteScore
1.20
自引率
16.70%
发文量
276
审稿时长
5.5 months
期刊介绍: The Journal of the Korean Physical Society (JKPS) covers all fields of physics spanning from statistical physics and condensed matter physics to particle physics. The manuscript to be published in JKPS is required to hold the originality, significance, and recent completeness. The journal is composed of Full paper, Letters, and Brief sections. In addition, featured articles with outstanding results are selected by the Editorial board and introduced in the online version. For emphasis on aspect of international journal, several world-distinguished researchers join the Editorial board. High quality of papers may be express-published when it is recommended or requested.
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