Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/154005
Title: Large enhancement of thermoelectric performance in MoS₂/h-BN heterostructure due to vacancy-induced band hybridization
Authors: Wu, Jing
Liu, Yanpeng
Liu, Yi
Cai, Yongqing
Zhao, Yunshan
Ng, Hong Kuan
Watanabe, Kenji
Taniguchi, Takashi
Zhang, Gang
Qiu, Cheng-Wei
Chi, Dongzhi
Neto, A. H. Castro
Thong, John T. L.
Loh, Kian Ping
Hippalgaonkar, Kedar
Keywords: Engineering::Materials
Science::Physics
Issue Date: 2020
Source: Wu, J., Liu, Y., Liu, Y., Cai, Y., Zhao, Y., Ng, H. K., Watanabe, K., Taniguchi, T., Zhang, G., Qiu, C., Chi, D., Neto, A. H. C., Thong, J. T. L., Loh, K. P. & Hippalgaonkar, K. (2020). Large enhancement of thermoelectric performance in MoS₂/h-BN heterostructure due to vacancy-induced band hybridization. Proceedings of the National Academy of Sciences of the United States of America, 117(25), 13929-13936. https://dx.doi.org/10.1073/pnas.2007495117
Project: 152 70 00015
MOE2018-T3-1-005
152 70 00014
R-263-000-B91-305
R-144-000-295-281
Journal: Proceedings of the National Academy of Sciences of the United States of America
Abstract: Local impurity states arising from atomic vacancies in two-dimensional (2D) nanosheets are predicted to have a profound effect on charge transport due to resonant scattering and can be used to manipulate thermoelectric properties. However, the effects of these impurities are often masked by external fluctuations and turbostratic interfaces; therefore, it is challenging to probe the correlation between vacancy impurities and thermoelectric parameters experimentally. In this work, we demonstrate that n-type molybdenum disulfide (MoS₂) supported on hexagonal boron nitride (h-BN) substrate reveals a large anomalous positive Seebeck coefficient with strong band hybridization. The presence of vacancies on MoS₂ with a large conduction subband splitting of 50.0 ± 5.0 meV may contribute to Kondo insulator-like properties. Furthermore, by tuning the chemical potential, the thermoelectric power factor can be enhanced by up to two orders of magnitude to 50 mW m⁻¹ K⁻² Our work shows that defect engineering in 2D materials provides an effective strategy for controlling band structure and tuning thermoelectric transport.
URI: https://hdl.handle.net/10356/154005
ISSN: 0027-8424
DOI: 10.1073/pnas.2007495117
Rights: © 2020 The Author(s) (Published by National Academy of Sciences). All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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