New long wavelength Al0.48In0.52As/Ga0.47In0.53As avalanche photodiode grown by molecular beam epitaxy

Abstract
We report the first Al0.48In0.52As/Ga0.47In0.53As long wavelength avalanche photodiode. The device, grown by molecular beam epitaxy, has high responsivities over a wide spectral range (0.85–1.7 μm). Avalanche gains of ≂27 at relatively low operating voltages (≲30 V) are observed. The band edge discontinuities of this heterojunction make these devices potentially faster than similar abrupt structures of InP/Ga0.47In0.53As. Fast response with a full width at half‐maximum of ≂250 ps and no tails are observed.