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Efficient thermoelectric energy conversion on quasi-localized electron states in diameter modulated nanowires.

Zianni X - Nanoscale Res Lett (2011)

Bottom Line: It is known that the thermoelectric efficiency of nanowires increases when their diameter decreases.We showed that the electron thermoelectric properties depend strongly on the geometry of the diameter modulation.It is demonstrated that quasi-localized states can be formed that are prosperous for efficient thermoelectric energy conversion.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Applied Sciences, Technological Institution of Chalkida, Psachna, 34400 Evia, Greece. xzianni@teihal.gr.

ABSTRACT
It is known that the thermoelectric efficiency of nanowires increases when their diameter decreases. Recently, we proposed that increase of the thermoelectric efficiency could be achieved by modulating the diameter of the nanowires. We showed that the electron thermoelectric properties depend strongly on the geometry of the diameter modulation. Moreover, it has been shown by another group that the phonon conductivity decreases in nanowires when they are modulated by dots. Here, the thermoelectric efficiency of diameter modulated nanowires is estimated, in the ballistic regime, by taking into account the electron and phonon transmission properties. It is demonstrated that quasi-localized states can be formed that are prosperous for efficient thermoelectric energy conversion.

No MeSH data available.


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The electron figure of merit ZT0 versus EF at T = 5 K (red), 10 K (blue) and 50 K (green).
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Figure 3: The electron figure of merit ZT0 versus EF at T = 5 K (red), 10 K (blue) and 50 K (green).

Mentions: At the transmission resonance R, ZT0 has been found to increase with increasing temperature T and decreasing broadening Γ (Figure 3). This behaviour can be qualitatively interpreted by the following expression that has been derived for an isolated resonance assuming a symmetric Lorentzian-function for the transmission coefficient [11]:(9)


Efficient thermoelectric energy conversion on quasi-localized electron states in diameter modulated nanowires.

Zianni X - Nanoscale Res Lett (2011)

The electron figure of merit ZT0 versus EF at T = 5 K (red), 10 K (blue) and 50 K (green).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211351&req=5

Figure 3: The electron figure of merit ZT0 versus EF at T = 5 K (red), 10 K (blue) and 50 K (green).
Mentions: At the transmission resonance R, ZT0 has been found to increase with increasing temperature T and decreasing broadening Γ (Figure 3). This behaviour can be qualitatively interpreted by the following expression that has been derived for an isolated resonance assuming a symmetric Lorentzian-function for the transmission coefficient [11]:(9)

Bottom Line: It is known that the thermoelectric efficiency of nanowires increases when their diameter decreases.We showed that the electron thermoelectric properties depend strongly on the geometry of the diameter modulation.It is demonstrated that quasi-localized states can be formed that are prosperous for efficient thermoelectric energy conversion.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Applied Sciences, Technological Institution of Chalkida, Psachna, 34400 Evia, Greece. xzianni@teihal.gr.

ABSTRACT
It is known that the thermoelectric efficiency of nanowires increases when their diameter decreases. Recently, we proposed that increase of the thermoelectric efficiency could be achieved by modulating the diameter of the nanowires. We showed that the electron thermoelectric properties depend strongly on the geometry of the diameter modulation. Moreover, it has been shown by another group that the phonon conductivity decreases in nanowires when they are modulated by dots. Here, the thermoelectric efficiency of diameter modulated nanowires is estimated, in the ballistic regime, by taking into account the electron and phonon transmission properties. It is demonstrated that quasi-localized states can be formed that are prosperous for efficient thermoelectric energy conversion.

No MeSH data available.


Related in: MedlinePlus