Cubic NaSbS2 as an Ionic–Electronic Coupled Semiconductor for Switchable Photovoltaic and Neuromorphic Device Applications

P. C. Harikesh; Abhijith Surendran; Biplab Ghosh; Rohit Abraham John; Arjun Moorthy; Natalia Yantara; Teddy Salim; Krishnamoorthy Thirumal; Wei Lin Leong; Subodh Mhaisalkar; Nripan Mathews

doi:10.1002/adma.201906976

Cubic NaSbS₂ as an Ionic–Electronic Coupled Semiconductor for Switchable Photovoltaic and Neuromorphic Device Applications

P. C. Harikesh, Abhijith Surendran, Biplab Ghosh, Rohit Abraham John, Arjun Moorthy, Natalia Yantara, Teddy Salim, Krishnamoorthy Thirumal, Wei Lin Leong, Subodh Mhaisalkar, Nripan Mathews^*

^*Corresponding author for this work

Biomedical Engineering

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

The recent emergence of lead halide perovskites as ionic–electronic coupled semiconductors motivates the investigation of alternative solution-processable materials with similar modulatable ionic and electronic transport properties. Here, a novel semiconductor—cubic NaSbS₂—for ionic–electronic coupled transport is investigated through a combined theoretical and experimental approach. The material exhibits mixed ionic–electronic conductivity in inert atmosphere and superionic conductivity in humid air. It is shown that post deposition electronic reconfigurability in this material enabled by an electric field induces ionic segregation enabling a switchable photovoltaic effect. Utilizing post-perturbation of the ionic composition of the material via electrical biasing and persistent photoconductivity, multistate memristive synapses with higher-order weight modulations are realized for neuromorphic computing, opening up novel applications with such ionic–electronic coupled materials.

Original language	English (US)
Article number	1906976
Journal	Advanced Materials
Volume	32
Issue number	7
DOIs	https://doi.org/10.1002/adma.201906976
State	Published - Feb 1 2020

Funding

A.S., B.G., and R.A.J. contributed equally to this work. This work was funded by National Research Foundation (NRF), Singapore through the CRP programme (NRF-CRP14-2014-03) and the Intra-CREATE Collaborative Grant (NRF2018-ITC001-001). Funding from Ministry of Education Singapore through MOE2016-T2-1-100 and MOE2018-T2-2-083 are also acknowledged. Funding from Office of Naval Research Global (ONRG-NICOP-N62909-17-1-2155) is also acknowledged. The authors gratefully acknowledge Dr. Sudhanshu Shukla's help in the initial preparation of sulphurized samples.

Keywords

ionic–electronic semiconductors
neuromorphic computing
perovskite-inspired chalcogenides
superionic conductors
switchable photovoltaic effect

ASJC Scopus subject areas

General Materials Science
Mechanics of Materials
Mechanical Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1002/adma.201906976

Cite this

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title = "Cubic NaSbS2 as an Ionic–Electronic Coupled Semiconductor for Switchable Photovoltaic and Neuromorphic Device Applications",

abstract = "The recent emergence of lead halide perovskites as ionic–electronic coupled semiconductors motivates the investigation of alternative solution-processable materials with similar modulatable ionic and electronic transport properties. Here, a novel semiconductor—cubic NaSbS2—for ionic–electronic coupled transport is investigated through a combined theoretical and experimental approach. The material exhibits mixed ionic–electronic conductivity in inert atmosphere and superionic conductivity in humid air. It is shown that post deposition electronic reconfigurability in this material enabled by an electric field induces ionic segregation enabling a switchable photovoltaic effect. Utilizing post-perturbation of the ionic composition of the material via electrical biasing and persistent photoconductivity, multistate memristive synapses with higher-order weight modulations are realized for neuromorphic computing, opening up novel applications with such ionic–electronic coupled materials.",

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