TY JOUR TI HIGH QUALITY GAN AND ALGAN LAYERS GROWN BY AMMONIA MBE WITH US GA AS SURFACTANT KW heterostructures KW AlN/AlGaN KW uv optoelectronic devices KW microwave transistors KW dislocation dencit JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Zaytsev , S.. AU Novikov, S.. AU Petrov , S.. AU Mamaev , V.. AU Prokhorenkov , D.. PY 2017 IS 2 PB Belgorod State Technological University named after V.G. Shukhov