FIELD: optoelectronics. SUBSTANCE: semiconductor structure base phototriac has base regions made in source material layer and accommodating external emitter regions provided with metal contacts and at least one vacant section for light beam access arranged symmetrically in respect to center line or structure symmetry plane; base regions are located on one side of structure symmetrically in respect to center line or its symmetry axis. EFFECT: enlarged functional capabilities. 7 dwg
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