Before revision: +Sample uses of technology-critical elements (excluding rare-earth) Element Compound ApplicationsGallium GaAs, GaN Wafers for (a) integrated circuits in high-performance computers and telecommunications equipment and (b) LEDs, photodetectors, solar cells and medical equipment Trimethyl Ga, triethyl Ga Epitaxial layering process for the production of LEDsGermanium Ge Substrate for wafers for high-efficiency photovoltaic cells Ge single crystals Detectors (airport security)Hafnium Hf Aerospace alloys and ceramics HfO2 Semiconductors and data storage devicesIndium In2O5Sn Transparent conductive thin film coatings on flat-panel displays (e.g.
After revision: +Sample uses of technology-critical elements (excluding rare-earth) Element Compound ApplicationsGallium GaAs, GaN Wafers for (a) integrated circuits in high-performance computers and telecommunications equipment and (b) LEDs, photodetectors, solar cells and medical equipmentTrimethyl Ga, triethyl Ga Epitaxial layering process for the production of LEDs(Ge) Germanium Ge Substrate for wafers for high-efficiency photovoltaic cellsGe single crystals Detectors (airport security)Hafnium (Hf) Hf(Ga)(In) Aerospace alloys and ceramics HfO2 Semiconductors and data storage devicesIndium In2O5Sn Transparent conductive thin film coatings on flat-panel displays (e.g.