Heat Reduction in Semiconductors by Phonon Annihilation

The objective of this project is to develop multiscale simulation tools for coupled carrier-phonon transport in micro/optoelectronic devices and to explore novel concepts of phonon engineering for heat removal and termal management in advancedsemiconductor devices. The phase I effort resulted in a prototype software modules for multiscale simulation of phonon dynamics in LD semiconductors and proven feasibility of using phonon annihilation for heat reduction in electronic devices. It has beenobserved that if phonon waves of different phase interact, they could, under the right set of circumstances, cause either constructive or destructive interference. CFDRC and UCR team plans to use existing commercial Multiphysics CFD-ACE+ softwareenvironment as a platform to implement comprehensive multiscale (quantum to continum) modeling tools for phonon engineering and couple it to existing carrier, optical and thermal models. We will utilize the tools for detailed examination of new methods ofheat reduction by phonon engineering such as generation of coherent confined acoustic phonons by drifting electrons in LD structures, investigation of the effects of the acoustic impedance mismatch, phonon filters by using Q dots/wire gratings, periodicphonon bandgap structures,