Making LEDs in the Home Fab

Hackaday reports that Dr. Semiconductor fabricated a gallium nitride LED on a sapphire substrate, then etched contacts with an ultraviolet laser and cleaned them with potassium hydroxide. He sliced the wafer with the same laser, electroplated indium bumps onto a printed circuit board, positioned the chip, added rosin flux and melted the indium to bond it. The result is a blue‑light LED that glows when powered from the board, showing the entire home‑fabrication cycle works.

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