Manipulating Heat Flow through 3 Dimensional Nanoscale Phononic Crystal Structure
Abstract
In this project, we have studied, through computer simulation, how the three dimensional (3D) phononic crystal structures can confine phonon and thus reduce thermal conductivity significantly leading to an enhancement of efficiency of energy conversion in thermoelectric applications. In particular, we have studied a nanoscale 3D Si phononic crystal (PnC) with spherical pores, which can reduce thermal conductivity of bulk Si by a factor up to 10,000 times at room temperature. The phonon participation ratio spectra demonstrate that more phonons are localized as the porosity increases. The thermal conductivity is found insensitive to the temperature changes from room temperature to 1,100K. The effect of period length and mass ratio on thermal conductivity is also studied.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 02, 2014
- Accession Number
- ADA602272
Entities
People
- Baowen Li
Organizations
- National University of Singapore