Patent ID: 7012239

Claim:
A silicon optoelectronic device comprising: an n- or p-type silicon-based substrate; an optoelectronic device portion including a doped region doped with a dopant of the opposite type to the substrate on a portion of the substrate, the doped region provided to emit and absorb light, and a plurality of semiconductor material regions formed on a rear surface of the substrate, wherein at least one portion of the plurality of semiconductor material regions and the doped region form a stack structure, the semiconductor material regions adjacent to the substrate have the opposite conductivity type to the substrate, and the neighbouring semiconductor material regions have the opposite conductive types to each, thereby providing a built-in transistor having at least two steps; a switching portion formed on one side of the optoelectronic device portion and shared with the substrate, the switching portion selectively controlling emission and detection of light in the optoelectronic device portion; and an electrode structure that performs at least one of supplying an electrical signal to the optoelectronic device portion and switching portion for controlling emission and detection of light, and outputting a light detection signal.