Browsing by Author "Yao, Hsuan-Te"

Now showing 1 - 2 of 2

Atomic-Scale Field-Effect Transistor as a Thermoelectric Power Generator and Self-Powered Device
(2011-08-04)
Liu, Yu-Shen
;
Yao, Hsuan-Te
;
Chen, Yu-Chang
;
電子物理學系
;
Department of Electrophysics
Using first-principles approaches, we have investigated the thermoelectric properties and energy conversion efficiency of the paired metal-Br-Al junction. Owing to the narrow states in the vicinity of the chemical potential, the nano junction has large Seebeck coefficients such that it can be considered an efficient thermoelectric power generator. We also consider the nanojunction in a three-terminal geometry, where the current, voltage, power, and efficiency can be efficiently modulated by the gate voltages. Such current-voltage characteristics could be useful in the design of nanoscale electronic devices such as a transistor or switch. Notably, the nanojunction as a transistor with a fixed finite temperature difference between electrodes can power itself using the Seebeck effect.
Oscillatory and sign-alternating behaviors of the Seebeck coefficients in carbon monatomic junctions
(2013-09-24)
Hsu, Bailey C.
;
Yao, Hsuan-Te
;
Liu, Wei-Lin
;
Chen, Yu-Chang
;
交大名義發表
In the framework of density functional theory combined with the Lippmann-Schwinger formalism in scattering approaches, we calculate the Seebeck coefficients for carbon atom chains sandwiched between aluminum electrodes from first principles. The most striking feature is that the Seebeck coefficients are length dependent, and can be negative (n type) or positive (p type) for odd- or even-numbered carbon atom chains. Alternating n-type and p-type material properties of carbon atom chains are due to the full-and half-filled pi* -orbital states near the chemical potential.