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Title: High thermoelectric efficiency in monolayer PbI2 from 300 K to 900 K

Journal Article · · Inorganic Chemistry Frontiers (Online)
DOI:https://doi.org/10.1039/c8qi01297k· OSTI ID:1556115
 [1];  [1]; ORCiD logo [2]; ORCiD logo [3];  [1];  [1];  [1];  [4];  [1]
  1. Fudan Univ., Shanghai (China)
  2. Fudan Univ., Shanghai (China); Ames Lab. and Iowa State Univ., Ames, IA (United States)
  3. Ningbo Institute of Materials Technology and Engineering; Chinese Academy of Sciences; Ningbo 315201; China
  4. Ames Lab. and Iowa State Univ., Ames, IA (United States); Foundation for Research and Technology (FORTH) (Greece)

By using a first-principles approach, monolayer PbI2 is found to have great potential in thermoelectric applications. The linear Boltzmann transport equation is applied to obtain the perturbation to the electron distribution by different scattering mechanisms. The mobility is mainly limited by the deformation-potential interaction with long-wavelength acoustic vibrations at low carrier concentrations. At high concentrations, ionized impurity scattering becomes stronger. The electrical conductivity and Seebeck coefficient are calculated accurately over various ranges of temperature and carrier concentration. The lattice thermal conductivity of PbI2, 0.065 W/mK at 300 K, is the lowest among other 2D thermoelectric materials. Such ultralow thermal conductivity is attributed to large atomic mass, weak interatomic bonding, strong anharmonicity, and localized vibrations in which the vast majority of heat is trapped. These electrical and phonon transport properties enable high thermoelectric figure of merit over 1 for both p-type and n-type doping from 300 K to 900 K. A maximum zT of 4.9 is achieved at 900 K with an electron concentration of 1.9X1012 cm-2. Our work shows exceptionally good thermoelectric energy conversion efficiency in monolayer PbI2, which can be integrated to the existing photovoltaic devices.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
11374063; 11404348; 2013CBA01505; AC02-07CH11358; 320081
OSTI ID:
1556115
Alternate ID(s):
OSTI ID: 1497924
Report Number(s):
IS-j 9932; ICFNAW
Journal Information:
Inorganic Chemistry Frontiers (Online), Vol. 6, Issue 4; ISSN 2052-1553
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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