Journal
NANO LETTERS
Volume 15, Issue 10, Pages 6302-6308Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01013
Keywords
Titanium disulfide; transition-metal dichalcogenide; thermoelectrics; hybrid materials; dielectric mismatch
Categories
Funding
- Takahashi Industrial and Economic Foundation
- Thermal and Electrical Energy Technology Foundation Research Grant
- JSPS KAKENHI grant [26820295]
- 1000 Plan Program for Young Talents of China
- JSPS [25289226]
- TherMat
- NSF [1512776]
- National Science Foundation [CNS-0821794]
- University of Colorado Boulder
- University of Colorado Denver
- National Center for Atmospheric Research
- Grants-in-Aid for Scientific Research [26820295] Funding Source: KAKEN
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1512776] Funding Source: National Science Foundation
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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 Coulombimpurity 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.
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