Journal
NANO LETTERS
Volume 13, Issue 2, Pages 358-363Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl303321g
Keywords
Molybdenum disulfide nanosheets; scanning photocurrent microscopy; photoresponse; photothermoelectric effect; Seebeck coefficient
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Funding
- European Union
- Dutch organization for Fundamental Research on Matter (FOM)
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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 hole 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 -4 X 10(2) and -1 X 10(5) mu VK-1. 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.
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