Project R-5471

Highly non-equilibrium electron relaxation mechanism in n-type CVD diamond (Research)

For a long time, the extreme properties of diamond are recognized. However, many fundamental questions still need to be answered in order to understand its uniqueness. One of the gripping properties is the resistance to high power conditions. A high excitation power density regime creates a highly non-equilibrium distribution of charge carriers. To restore the equilibrium the excess energy has to be dissipated. In this process the lattice vibrations, so-called phonons, are involved. A large population of phonons appears as a result of charge carrier relaxation and complicates the energy relaxation process. Although this process is well studied in other wide band gap materials, the quality of man-made diamond has just become suitable for such an investigation. Moreover, as diamond is capable to withstand a much higher excitation power density regime than any other known material, the current available models are insufficient. Thus, it opens up opportunities to develop new physics. This project aims to understand the fundamental behavior of non-equilibrium electrons and phonons in diamond, which are created under high injection currents. Additionally, the role of extreme diamond properties in the event of energy relaxation is studied.

01 October 2014 - 30 September 2017