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Wan C, Kodama Y, Kondo M, et al. Dielectric Mismatch Mediates Carrier Mobility in Organic-Intercalated Layered TiS2. Nano Lett. 2015;15(10):6302-8doi: 10.1021/acs.nanolett.5b01013.
Wan, C., Kodama, Y., Kondo, M., Sasai, R., Qian, X., Gu, X., Koga, K., Yabuki, K., Yang, R., & Koumoto, K. (2015). Dielectric Mismatch Mediates Carrier Mobility in Organic-Intercalated Layered TiS2. Nano letters, 15(10), 6302-8. https://doi.org/10.1021/acs.nanolett.5b01013
Wan, Chunlei, et al. "Dielectric Mismatch Mediates Carrier Mobility in Organic-Intercalated Layered TiS2." Nano letters vol. 15,10 (2015): 6302-8. doi: https://doi.org/10.1021/acs.nanolett.5b01013
Wan C, Kodama Y, Kondo M, Sasai R, Qian X, Gu X, Koga K, Yabuki K, Yang R, Koumoto K. Dielectric Mismatch Mediates Carrier Mobility in Organic-Intercalated Layered TiS2. Nano Lett. 2015 Oct 14;15(10):6302-8. doi: 10.1021/acs.nanolett.5b01013. Epub 2015 Sep 01. PMID: 26308495.
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Nano Lett. 2015 Oct 14;15(10):6302-8. doi: 10.1021/acs.nanolett.5b01013. Epub 2015 Sep 01.

Dielectric Mismatch Mediates Carrier Mobility in Organic-Intercalated Layered TiS2.

Nano letters

Chunlei Wan, Yumi Kodama, Mami Kondo, Ryo Sasai, Xin Qian, Xiaokun Gu, Kenji Koga, Kazuhisa Yabuki, Ronggui Yang, Kunihito Koumoto

Affiliations

  1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, China.
  2. Graduate School of Engineering, Nagoya University , Nagoya 464-8603, Japan.
  3. Interdisciplinary Graduate School of Science and Engineering, Shimane University , 1060 Nishikawatsu-cho, Matsue 690-8504, Japan.
  4. Department of Mechanical Engineering, University of Colorado , Boulder, Colorado 80309, United States.
  5. KOBELCO Research Institute , Kobe, Hyogo 651-2271, Japan.

PMID: 26308495 DOI: 10.1021/acs.nanolett.5b01013

Abstract

The dielectric constant is a key parameter that determines both optical and electronic properties of materials. It is desirable to tune electronic properties though dielectric engineering approach. Here, we present a systematic approach to tune carrier mobilities of hybrid inorganic/organic materials where layered two-dimensional transition-metal dichalcogenide TiS2 is electrochemically intercalated with polar organic molecules. By manipulating the dielectric mismatch using polar organic molecules with different dielectric constants, ranging from 10 to 41, the electron mobility of the TiS2 layers was changed three times due to the dielectric screening of the Coulomb-impurity scattering processes. Both the overall thermal conductivity and the lattice thermal conductivity were also found to decrease with an increasing dielectric mismatch. The enhanced electrical mobility along with the decreased thermal conductivity together gave rise to a significantly improved thermoelectric figure of merit of the hybrid inorganic/organic materials at room temperature, which might find applications in wearable electronics.

Keywords: Titanium disulfide; dielectric mismatch; hybrid materials; thermoelectrics; transition-metal dichalcogenide

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