Phonon-electron interactions in piezoelectric semiconductor bulk acoustic wave resonators.

ABSTRACT: This work presents the first comprehensive investigation of phonon-electron interactions in bulk acoustic standing wave (BAW) resonators made from piezoelectric semiconductor (PS) materials. We show that these interactions constitute a significant energy loss mechanism and can set practical loss limits lower than anharmonic phonon scattering limits or thermoelastic damping limits. Secondly, we theoretically and experimentally demonstrate that phonon-electron interactions, under appropriate conditions, can result in a significant acoustic gain manifested as an improved quality factor (Q). Measurements on GaN resonators are consistent with the presented interaction model and demonstrate up to 35% dynamic improvement in Q. The strong dependencies of electron-mediated acoustic loss/gain on res

SUBMITTER: Gokhale VJ 

PROVIDER: S-EPMC4085633 | biostudies-literature | 2014 Jul

REPOSITORIES: biostudies-literature