Journal
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 47, Issue 3, Pages 1541-1543Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.47.1541
Keywords
AlGaN; p-i-n; photodetector; solar blind; dark current
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We report on the fabrication and characterization of high-performance AlGaN solar-blind p-i-n photodiodes grown on AlN/sapphire templates by metal organic chemical vapor deposition. The realized devices demonstrate a sharp spectral cutoff with a drop of four orders of magnitude from 260 to 310 nm under the 1 mu W/cm(2) illumination. Dark current density as low as 2.6 x 10(-11) A/cm(2) at -5 V bias has been measured. The zero bias external quantum efficiency peaks at 258 nm with a value of 30%. The upper-bound detectivity limited by Johnson noise is calculated to be 7.1 x 10(14) cm.Hz(1/2)/W at 300 K.
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