1.31 μm GaAs-based heterojunction p– i– n photodetectors using InGaAsNSb as the intrinsic layer grown by molecular beam epitaxy

Abstract

GaAs-based double-heterojunction p– i– n photodetectors using In z Ga 1− z As 1− x− y N x Sb y in the i-layer are fabricated for the first time using the solid source molecular beam epitaxy growth method. A peak responsivity of ∼ 0.29 A/W, corresponding to quantum efficiencies (QE) of 38% is attained from the best p– i– n device between 0.9 and 1.1 μm. The dark current is ∼ 70 nA at a reverse bias of 2 V and the cutoff wavelength reaches ∼ 1.4 μm. The surfactant effect generated by the presence of Sb in this material allows thick high quality dilute nitride material growth. 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.