Energy gap 26 Wide band gap semiconductors 23 II-VI semiconductors 14 Optical properties 13 Zinc oxide 12 III-V semiconductors 10 Band gap 9 Gallium nitride 9 Thin films 8 Scanning electron microscopy 7 Band gap energy 6 Property 6 Semiconductor doping 6 Technology: general issues 6 X ray diffraction 6 History of engineering and technology 5 Optical band gap energy 5 Oxide minerals 5 Performance 5 Research & information: general 5 Research and information: general 5 Selenium compounds 5 Sol-gels 5 Sulfur compounds 5 Titanium dioxide 5 Ultraviolet visible spectroscopy 5 Fabrication 4 Light absorption 4 Magnetic semiconductors 4 Nanocrystals 4