Long-wavelength type-II photodiodes operating at room temperature

The operation of uncooled InAs-GaSb superlattice photodiodes with a cutoff wavelength of lambda (c) = 8 mum and a peak detectivity of 1.2 x 10(8) cmHz (1)/(2)/W at zero bias is demonstrated. The detectivity is similar to the b est uncooled HgCdTe detectors and microbolometers, However, the R(0)A produ ct is more than two orders of magnitude higher than HgCdTe and the device i s more than four orders of magnitude faster than microbolometers, These fea tures combined with their low 1/f noise and high uniformity make these type -II photodiodes an excellent choice for uncooled high-speed IR imaging arra ys.