GaN-based photocathodes with extremely high quantum efficiency

Uchiyama, Shoichi; Takagi, Yasufumi; Niigaki, Minoru; Kan, Hirofumi; Kondoh, Haruyasu
March 2005
Applied Physics Letters;3/7/2005, Vol. 86 Issue 10, p103511
Academic Journal
We have fabricated phototubes with photocathodes consisting of the Mg-doped GaN films. The spectral shapes of the response and the quantum efficiency (QE) strongly depend on the Mg-doping concentration. The calibrated QE of the photocathode is maximized to be 71.9% at a photon energy of 5.4 eV by a Mg-doping concentration of 3.0×1019 cm-3. Consequently, a phototube with the GaN-based photocathode is realized to demonstrate a very high QE, more than 50% and sharp cutoff characteristic over three orders of magnitude.


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