Large and Tunable Photothermoelectric Effect in Single-Layer MoS2

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• 作者：Michele Buscema ; Maria Barkelid ; Val Zwiller ; Herre S. J. van der Zant ; Gary A. Steele ; Andres Castellanos-Gomez
• 刊名：Nano Letters
• 出版年：2013
• 出版时间：February 13, 2013
• 年：2013
• 卷：13
• 期：2
• 页码：358-363
• 全文大小：364K
• 年卷期：v.13,no.2(February 13, 2013)
• ISSN：1530-6992

文摘

We study the photoresponse of single-layer MoS₂ field-effect transistors by scanning photocurrent microscopy. We find that, unlike in many other semiconductors, the photocurrent generation in single-layer MoS₂ is dominated by the photothermoelectric effect and not by the separation of photoexcited electron鈥揾ole pairs across the Schottky barriers at the MoS₂/electrode interfaces. We observe a large value for the Seebeck coefficient for single-layer MoS₂ that by an external electric field can be tuned between 鈭? 脳 10² and 鈭? 脳 10⁵ 渭V K^鈥?. This large and tunable Seebeck coefficient of the single-layer MoS₂ paves the way to new applications of this material such as on-chip thermopower generation and waste thermal energy harvesting.

Keywords:

Molybdenum disulfide nanosheets; scanning photocurrent microscopy; photoresponse; photothermoelectric effect; Seebeck coefficient