We report high performance uncooled midwavelength infrared photodiodes based on interface-engineered InAsGaSb superlattice. Two distinct superlattices were designed with a cutoff wavelength around 5 μm for room temperature and 77 K. The device quantum efficiency reached more than 25% with responsivity around 1 AW. Detectivity was measured around 109 cm Hz12 W at room temperature and 1.5× 1013 cm Hz12 W at 77 K under zero bias. The devices were without antireflective coating. The device quantum efficiency stays at nearly the same level within this temperature range. Additionally, Wannier-Stark oscillations in the Zener tunneling current were observed up to room temperature.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)