Details

Autor(en) / Beteiligte

• Youtsey, C.
• Adesida, I.
• Romano, L. T.
• Bulman, G.

Titel

Smooth n-type GaN surfaces by photoenhanced wet etching

Ist Teil von

• Applied physics letters, 1998-02, Vol.72 (5), p.560-562

Erscheinungsjahr

1998

Quelle

American Institute of Physics

Beschreibungen/Notizen

• A room-temperature photoelectrochemical wet etching process is described that produces smoothly etched GaN surfaces using KOH solution and Hg arc lamp illumination. Atomic force microscope measurements indicate a root-mean-square etched surface roughness of 1.5 nm, which compares favorably to the unetched surface roughness of approximately 0.3 nm. Etch rates of 50 nm/min were obtained using a KOH solution concentration of 0.02 M and an illumination intensity of 40 mW/cm2. It is shown that the smooth etching occurs under conditions of low KOH solution concentration and high light intensities, which result in a diffusion-limited etch process.