Nanostructured Perovskites for Retina-inspired Structurally Tunable Synapse
Kyuho Lee a, Hyowon Han a, Cheolmin Park a
a Department of Materials Science and Engineering, Yonsei University, Seoul, KR, Korea, Republic of
Proceedings of International Conference on Perovskite Memristors and Electronics 2021 (ICPME2021)
Online, Spain, 2021 December 13th - 14th
Organizers: Ho Won Jang and Ankur Solanki
Invited Speaker, Cheolmin Park, presentation 008
DOI: https://doi.org/10.29363/nanoge.icpme.2021.008
Publication date: 1st December 2021

Ordered nanostructured crystals of thin perovskites films are of great interest to researchers because of the dimensional-dependence of their photoelectronic properties for developing the perovskites with novel properties [1]. In this presentation, both top-down and bottom-up approaches for fabricating nanostructured perovskite films are demonstrated. First, a variety of micro/nanopatterns of a perovskite film are fabricated by either micro/nano-imprinting or transfer-printing a thin spin-coated precursor film in soft-gel state with a topographically pre-patterned polymer mold, followed by thermal treatment for complete conversion of the precursor film to a perovskite one [2]. Second, we also demonstrate a simple and robust route, involving the controlled crystallization of the perovskites templated with a self-assembled block copolymer (BCP), for fabricating nanopatterned perovskite films with various shapes and nanodomain sizes [3]. The nanopatterned perovskites showed significantly enhanced photoluminescence with high resistance to both humidity and heat due to geometrically confining crystals in the BCP domains. We also demonstrate an artificially intelligent photonic synapse based on a floating-gated field effect transistor with area-density-tunable perovskite nano-cone arrays templated in a BCP [4]. Our device is capable of electric charge (de)trapping and photo-excited charge generation, and it exhibits 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.

This research was supported by the National Research Foundation of Korea (Grant Nos. 2018M3D1A1058536 and 2020R1A2B5B03002697).

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