Retina-Inspired Structurally Tunable Synaptic Perovskite Nanocones

Kyuho Lee, Hyowon Han, Youngwoo Kim, Jumi Park, Seonghoon Jang, Hyeokjung Lee, Seung Won Lee, Ho Yeon Kim, Yeeun Kim, Taebin Kim, Dongho Kim, Gunuk Wang, Cheolmin Park

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


Artificial photonic synapses with morphologically controlled photoreception, allowing for area-dependent tunable light reception as well as information storage and learning, have potential for application in emerging photo-interactive neuro-computing technologies. Herein, an artificially intelligent (AI) photonic synapse with area-density-tunable perovskite nano-cone arrays templated in a self-assembled block copolymer (BCP) is presented, which is based on a field effect transistor with a floating gate of photoreceptive perovskite crystal arrays preferentially synthesized in a micro-phase-segregated BCP film. These arrays are capable of electric charge (de)trapping and photo-excited charge generation, and they exhibit versatile synaptic functions of the nervous system, including paired-pulse facilitation and long-term potentiation, with excellent reliability. The area-density variable perovskite floating gate developed by off-centered spin coating process allows for emulating the human retina with a position-dependent spatial distribution of cones. 60 × 12 arrays of the developed synapse devices exhibit position-dependent dual functions of receptor and synapse. They are AI and exhibit a pattern recognition accuracy up to ≈90% when examined using the Modified National Institute of Standards and Technology handwritten digit pattern recognition test.

Original languageEnglish
Article number2105596
JournalAdvanced Functional Materials
Issue number52
Publication statusPublished - 2021 Dec 22

Bibliographical note

Funding Information:
This study was supported by the Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2018M3D1A1058536). This study was also supported by a grant from the National Research Foundation of Korea (NRF) funded by the Korean government (MEST) (No. 2020R1A2B5B0300269711).

Publisher Copyright:
© 2021 Wiley-VCH GmbH


  • artificial retina
  • density-tunable perovskite nanocrystals
  • perovskite nanocones
  • photonic synapses
  • self-assembled photoreceptors

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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