| The project proposes new routes to overcome substantial difficulties in fabrication of InAlN. Finding a method to grow high quality InAlN lattice-matched to GaN (17% In) is fundamental for laser diodes (LDs) and vertical surface emitting lasers (VCSELs). InAlN could replace AlGaN and eliminate problems of lattice mismatch and improve refractive index contrast. We will grow by plasma-assisted molecular beam epitaxy (PAMBE) and perform Monte-Carlo simulations to get an insight to kinetic processes during the growth and understand the influence of the diffusion barriers. We will (1) address the problem of low Al diffusion at low temperatures using high miscut GaN substrates (Ga-polar, N-polar and semipolar), (2) apply extremely high nitrogen flux to improve structural properties and (3) verify the impact of dislocation density on the mechanism of “honeycomb” structure formation. The InAlN layers will be implemented in device structures processed and tested in collaboration with TopGaN. |
