GaAs-based heterojunction p-i-n photodetectors using pentanary InGaAsNSb as the intrinsic layer

Abstract

GaAs-based double-heterojunction p-i-n photodetectors using In/sub z/Ga/sub 1-z/As/sub 1-x-y/N/sub x/Sb/sub y/ in the i layer is fabricated for the first time using the solid source molecular beam epitaxy growth method. The surfactant effect generated by the presence of Sb in this material allows thick high-quality dilute nitride material growth. A peak responsivity of /spl sim/0.29 A/W, corresponding to quantum efficiencies of 38% is attained between 0.9 and 1.1 /spl mu/m from the best p-i-n device. The cutoff wavelength reaches /spl sim/1.4 /spl mu/m and the dark current is /spl sim/0.43 mA/cm/sup 2/ at a reverse bias of 2 V. A Sb-free p-i-n device consisting of InGaAsN-GaAs is also fabricated to compare the device performance with the InGaAsNSb-GaAs p-i-n devices.