SensoryAdaptation and Neuromorphic PhototransistorsBased on CsPb(Br1–xIx)3 Perovskite and MoS2 HybridStructure
2020
Sensory
adaptation is an essential part of biological neural systems
for sustaining human life. Using the light-induced halide phase segregation
of CsPb(Br1–xIx)3 perovskite, we introduce neuromorphic phototransistors
that emulate human sensory adaptation. The phototransistor based on
a hybrid structure of perovskite and transition-metal dichalcogenide
(TMD) emulates the sensory adaptation in response to a continuous
light stimulus, similar to the neural system. The underlying mechanism
for the sensory adaptation is the halide segregation of the mixed
halide perovskites. The phase separation under visible-light illumination
leads to the segregation of I and Br into separate iodide- and bromide-rich
domains, significantly changing the photocurrent in the phototransistors.
The devices are reversible upon the removal of the light stimulation,
resulting in near-complete recovery of the photosensitivity before
the phase segregation (sensitivity recovery of 96.65% for 5 min rest
time). The proposed phototransistor based on the perovskite–TMD
hybrid structure can be applied to other neuromorphic devices such
as neuromorphic photonic devices, intelligent sensors, and selective
light-detecting image sensors.
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