Nano-heterostructure

A nano-heterostructure comprising:

• a semiconductor layer comprising a first surface and a second surface opposite to the first surface;
• a first metallic carbon nanotube located on the first surface and extending along a first direction;
• a semiconducting carbon nanotube located on the first surface and extending along the first direction, the semiconducting carbon nanotube being parallel and spaced away from the first metallic carbon nanotube;
• and
• a second metallic carbon nanotube located on the second surface and extending along a second direction, an angle being formed between the first direction and the second direction;
• wherein a first three layered stereoscopic structure is formed at an intersection of the first metallic carbon nanotube, the second metallic carbon nanotube and the semiconductor layer;
• and a second three layered stereoscopic structure is formed at an intersection of the semiconducting carbon nanotube, the semiconductor layer and the second metallic carbon nanotube.