History
Nobody`s know when it was developed. Often ancient people mostly used it as poison. Aqua Tofana is the most famous case in history. Sicilian Tofana sold water without smell, color and taste. If you give a water person, she claimed, he soon will die painlessly. Scientists think that it was aqueous solution of arsenic acid with the addition of herbs Herba Cymbalariae.
Nowadays
Arsenic is used very widely. It is used in glass production, staining metals, dielectrics, semiconductors, poisonous gases and weapons. The most promising area of application of arsenic is , of course, semiconductor equipment. Particular importance it acquired in gallium arsenide GaAs and indium InAs. Gallium arsenide need for a major electronic equipment - optoelectronics, created in 1963 – 1965 years. Compared with conventional semiconductors IV group - germanium and silicon - arsenide elements of group III has two advantages. Width banned zone and mobility of charge carriers in them can vary more widely. And as mobile carriers charge, so at high frequencies can be used semiconductor device.
