“…With all these advantages, III-Nitride structures are the most suitable materials for fabrication of optoelectronic devices in blue and ultraviolet (UV) spectral regions. It is possible to grow high-quality InGaN epitaxial layers by modern crystal growth techniques such as molecular beam epitaxy (MBE) [7,9,10,13,19,20,23,30], radio frequency sputtering technique (RFSM) [11,14,16,[37][38][39] and metal organic chemical vapor deposition (MOCVD) [3-5, 17, 26, 36, 40]. The method of epitaxial crystal growth with a molecular beam involves the reaction of a thermal beam of atoms or molecules with a crystal surface in a very high vacuum environment.…”