Harikesh P C, Surendran Abhijith, Ghosh Biplab, John Rohit Abraham, Moorthy Arjun, Yantara Natalia, Salim Teddy, Thirumal Krishnamoorthy, Leong Wei Lin, Mhaisalkar Subodh, Mathews Nripan
Energy Research Institute @NTU (ERI@N), Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, Singapore, 637553, Singapore.
Interdisciplinary Graduate School, Energy Research Institute at NTU, Singapore, 639798, Singapore.
Adv Mater. 2020 Feb;32(7):e1906976. doi: 10.1002/adma.201906976. Epub 2020 Jan 8.
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 NaSbS -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.
卤化铅钙钛矿作为离子-电子耦合半导体的最新出现，激发了对具有类似可调制离子和电子传输特性的替代溶液可加工材料的研究。在此，通过理论与实验相结合的方法，对一种用于离子-电子耦合传输的新型半导体——立方硫化钠锑（NaSbS）进行了研究。该材料在惰性气氛中表现出混合离子-电子导电性，在潮湿空气中表现出超离子导电性。研究表明，通过电场实现的该材料沉积后电子可重构性会诱导离子分离，从而实现可切换的光伏效应。利用通过电偏置和持久光电导对材料离子组成进行的后扰动，实现了用于神经形态计算的具有高阶权重调制的多态忆阻突触，为这类离子-电子耦合材料开辟了新的应用领域。
