Patent ID: 7659129

Claim:
A “fabricating method for quantum dot active layer of LED by nano-lithography” comprises process steps as below: (a): Firstly, deposit a sealant of gas molecule or atom state on top-opening of a nano cylindrical pore on an epitaxy substrate so that the diameter of said top-opening gradually reduce to become a reduced nano-aperture, whose opening diameter is smaller than that of said top-opening; (b): Secondly, firmly place the epitaxy substrate on a tilt-rotary console having capability of 3-D tilt with rotation in horizontal direction and directly pass a deposit material of gas molecule or atom state perpendicularly through said reduced nano-aperture so that a nano quantum dot of nano structure with diameter being same as that of the reduced nano-aperture is directly formed on the surface of said epitaxy substrate, which being laid beneath the bottom of said nano cylindrical pore; (c): Thirdly, tilt rightwards the epitaxy substrate together with said tilt-rotary console in a right tilt angle by said reduced nano-aperture as center and re-pass the deposit material of gas molecule or atom state through said reduced nano-aperture in same direction as the previous direction so that another nano quantum dot of nano structure with diameter being same as that of the reduced nano-aperture is directly formed on the surface of said epitaxy substrate with position at right side of the previous nano quantum dot; d): Fourthly, tilt leftwards the epitaxy substrate together with said tilt-rotary console in a left tilt angle by said reduced nano-aperture as center and re-pass the deposit material of gas molecule or atom state through said reduced nano-aperture in same direction as the previous direction so that another nano quantum dot of nano structure with diameter being same as that of the reduced nano-aperture is directly formed on the surface of said epitaxy substrate with position at left side of the previous nano quantum dot; (e): Fifthly, properly rotate the epitaxy substrate together with said tilt-rotary console in a rotation angle by said reduced nano-aperture as center and re-pass the deposit material of gas molecule or atom state through said reduced nano-aperture in same direction as the previous direction so that a further nano quantum dot of nano structure with diameter being same as that of the reduced nano-aperture is directly formed on the surface of said epitaxy substrate with position at front side of the previous nano quantum dot; (f): Finally, by means of solution rinsing (i.e. wet etching) or gas etching (i.e. dry etching), remove all the nano cylindrical pores on the epitaxy substrate, many active layers of nano quantum dots in same dimension for the LED are fabricated on the epitaxy substrate in high density and even distribution manner.