In this paper detection performance of a resonant tunneling structure quantum cascade photodetector is investigated. The resonant tunneling structure is so that the photodetector in each period has a narrow well between two high barriers and its ground state is in resonance with the excited state of the active well. The existence of resonance causes that the excited state of the active well not to be more localized to the well, which causes easy transport of excited electrons, due to photons, inside the structure. In addition the existence of high barriers decreases dark current of the photodetector. The results of calculations show that these advantages cause peak detectivity of the photodetector to be that is two orders of magnitude higher than the detectivity of quantum cascade photodetectors with conventional structures

Keywords: Photodetector, Quanum Cascade, Quantum Well, Resonant Tunneling, Detectivity

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