Semiconductor doping Wide band gap semiconductors 4 Calculations 2 Electronic structure 2 Energy gap 2 II-VI semiconductors 2 Optical properties 2 Zinc oxide 2 Absorption spectroscopy 1 Aluminum oxide 1 Annealing temperatures 1 Band gap 1 Ca-doped α-Ga2O3 1 Calcium 1 Charge density distributions 1 Charge transfer 1 Complex dielectric functions 1 Computer software 1 Current-voltage measurements 1 Defect calculations 1 Defects 1 Density functional theory 1 Device fabrications 1 Dielectric function 1 Dielectric functions 1 Divalents 1 Doping concentration 1 Elastic moduli 1 Electrical characteristic 1 Electrical performance 1