Simultaneous Thermoelectric Property Measurement and Incoherent Phonon Transport in Holey Silicon.

بهبود بازده تبدیل انرژی حالت جامد با استفاده از نانوساختارهای ترموالکتریک

Solid-state energy conversion technologies such as thermoelectric refrigeration and power generation require materials with low thermal conductivity yet high electrical conductivity and Seebeck coefficiency. Although semiconductors are the best thermoelectric materials, they rarely have the such features. Nanostructures such as superlattices, quantum wires, and quantum dots provide novel method...

Ballistic phonon transport in holey silicon.

When the size of semiconductors is smaller than the phonon mean free path, phonons can carry heat with no internal scattering. Ballistic phonon transport has received attention for both theoretical and practical aspects because Fourier's law of heat conduction breaks down and the heat dissipation in nanoscale transistors becomes unpredictable in the ballistic regime. While recent experiments de...

Holey silicon as an efficient thermoelectric material.

This work investigated the thermoelectric properties of thin silicon membranes that have been decorated with high density of nanoscopic holes. These "holey silicon" (HS) structures were fabricated by either nanosphere or block-copolymer lithography, both of which are scalable for practical device application. By reducing the pitch of the hexagonal holey pattern down to 55 nm with 35% porosity, ...

Electron and phonon transport in silicon nanowires: Atomistic approach to thermoelectric properties

Exotic thermoelectric behavior in nitrogenated holey graphene

Combining first-principles approaches with the Boltzmann transport equation and semi-classical analysis we investigate the thermal conductivity k, thermopower S, electrical conductivity s, and carrier mobility m of newly synthesized nitrogenated holey graphene (NHG). Strikingly, the NHG possesses exceedingly high S and s but a fairly low lattice thermal conductivity kL, and therefore extraordin...