Electronic and structural properties of InN thin films grown by MOMBE on sapphire substrates

The development of high quality semiconductor thin films for different applications is a demanding problem in material science. InN has not been an intensively studied as AlN and GaN. There is relatively little information on the fundamental optical properties, charge carrier transport, and the properties and behavior of electrically active defects in the material. The absence of good-quality material lead even to conflicting data reported in the literature concerning the optical gap and band structure. In this publication it will be shown that InN thin films can be successfully grown using the MO MBE method. For the first time the proper choice of growth conditions allows to obtain good quality InN thin films with a charge carrier concentration as low as 8.8 X 10 18 cm -3 .