View : 550 Download: 0
High thermoelectric performance due to nanoinclusions and randomly distributed interface potentials in N-type (PbTe0.93-xSe0.07Clx)(0.93)(PbS)(0.07) composites
- Title
- High thermoelectric performance due to nanoinclusions and randomly distributed interface potentials in N-type (PbTe0.93-xSe0.07Clx)(0.93)(PbS)(0.07) composites
- Authors
- Ginting, Dianta; Lin, Chan-Chieh; Rathnam, Lydia; Yun, Jae Hyun; Yu, Byung-Kyu; Kim, Sung-Jin; Rhyee, Jong-Soo
- Ewha Authors
- 김성진
- SCOPUS Author ID
- 김성진
- Issue Date
- 2017
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- ISSN
- 2050-7488
2050-7496
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A vol. 5, no. 26, pp. 13535 - 13543
- Publisher
- ROYAL SOC CHEMISTRY
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- In a composite of two dissimilar or homologous semiconductors with different energy band gaps or metal/semiconductor composites, we expect a band bending effect at the interfaces. The band bending effect induced by the different Fermi levels of two compounds can selectively scatter carriers due to energydependent scattering time, resulting in enhancement of the Seebeck coefficient. In addition, nanoinclusions in a matrix will effectively scatter phonons. Here, we demonstrate the effects of electron and phonon scattering by nano-inclusions in n-type(PbTe0.93-xSe0.07Clx)0.93(PbS)(0.07) (x = 0.0005, 0.01, 0.1 and 0.2) composites. In the matrix, the nano-inclusions increased the Seebeck coefficient while reducing lattice thermal conductivity in (PbTe0.93-xSe0.07Clx)(0.93)(PbS)(0.07). The chlorine doping increases the Fermi level to the bottom of the conduction band giving rise to increased electron concentration. The simultaneous emergence of the high Seebeck coefficient and low thermal conductivity resulted in the exceptional ZT value of 1.52 at 700 K for low chlorine doping (x = 0.0005), which is a very high value in n-type thermoelectric materials. The randomly distributed interface potential, induced by Fermi level tuning, with nano-inclusions is a new criterion for investigating thermoelectric properties.
- DOI
- 10.1039/c7ta02643a
- Appears in Collections:
- 자연과학대학 > 화학·나노과학전공 > Journal papers
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML