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doping ") into the crystal structure . when two differently-doped regions exist in the same crystal, a semiconductor junction is created. the behavior of charge carriers , which include electrons , ions and electron holes , at these junctions is the basis of diodes , transistors and all modern electronics
of semiconductors are silicon , germanium , gallium arsenide , and elements near the so-called " metalloid staircase " on the periodic table . after silicon, gallium arsenide is the second most common semiconductor[ citation needed ] and is used in laser diodes, solar cells, microwave-frequency integrated...
https://en.wikipedia.org/wiki/Semiconductor
aruba live animals and animal products, art and collectibles, machinery and electrical equipment, transport equipment australia iron ore, coal, gold, natural gas, beef, aluminum ores and conc, wheat, meat (excluding beef), wool, alumina, alcohol austria machinery and equipment, motor vehicles and parts
products, timber eritrea gold and other minerals, livestock, sorghum, textiles, food, small industry manufactures estonia machinery and electrical equipment %, food products and beverages %, mineral fuels %, wood and wood products %, articles of base metals %, furniture and bedding %, vehicles and parts...
https://www.cia.gov/library/publications/the-world-factbook/fields/240.html