We report a systematic study of different transitions in quantum dots-in-a-well infrared
photodetectors in order to optimize the signal to noise ratio of the detector. Bound to
continuum transitions offer very high extraction probability for photoexcited electrons but
poor absorption coefficient, while the bound to bound transitions have higher absorption but
poorer extraction probability. Bound to quasibound transitions are optimum for intermediate
values of electric fields with superior signal to noise ratio. The bound to quasibound device …