Sensory Adaptation and Neuromorphic Phototransistors Based on CsPb(Br1- xIx)3Perovskite and MoS2Hybrid Structure

Seongin Hong, Seung Hee Choi, Jongsun Park, Hocheon Yoo, Joo Youn Oh, Euyheon Hwang, Dae Ho Yoon, Sunkook Kim

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)9796-9806
Number of pages11
JournalACS nano
Issue number8
Publication statusPublished - 2020 Aug 25


  • TMDs
  • hybrid structure
  • perovskite
  • phototransistors
  • sensory adaptation

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)


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