Light‐Stimulated Synaptic Transistors Fabricated by a Facile Solution Process Based on Inorganic Perovskite Quantum Dots and Organic Semiconductors

• Published in: Small (Weinheim an der Bergstrasse, Germany) Vol. 15; no. 11; pp. e1900010 - n/a
• Main Authors: Wang, Kai, Dai, Shilei, Zhao, Yiwei, Wang, Yan, Liu, Chuan, Huang, Jia
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 01.03.2019
• Subjects: blended materials; Charge efficiency; Crosstalk; Decay; Emulators; inorganic halide perovskite quantum dots; Light; light‐stimulated synaptic transistors; Memory devices; Nanotechnology; Organic semiconductors; Perovskites; Photoelectric effect; Photoelectric emission; Quantum dots; Semiconductor devices; Semiconductors; Separation; Signal processing; solution process; Transistors; organic semiconductors; light-stimulated synaptic transistors; solution process; blended materials; inorganic halide perovskite quantum dots
• ISSN: 1613-6810; 1613-6829; 1613-6829
• DOI: 10.1002/smll.201900010

Implementation of artificial intelligent systems with light‐stimulated synaptic emulators may enhance computational speed by providing devices with high bandwidth, low power computation requirements, and low crosstalk. One of the key challenges is to develop light‐stimulated devices that can response to light signals in a neuron‐/synapse‐like fashion. A simple and effective solution process to fabricate light‐stimulated synaptic transistors (LSSTs) based on inorganic halide perovskite quantum dots (IHP QDs) and organic semiconductors (OSCs) is reported. Blending IHP QDs and OSCs not only improves the charge separation efficiency of the photoexcited charges, but also induces delayed decay of the photocurrent in the IHP QDs/OSCs hybrid film. The enhanced charge separation efficiency results in high photoresponsivity, while the induced delayed decay of the photocurrent is critical to achieving light‐stimulating devices with a memory effect, which are important for achieving high synaptic performance. The LSSTs can respond to light signals in a highly neuron‐/synapse‐like fashion. Both short‐term and long‐term synaptic behaviors have been realized, which may lay the foundation for the future implementation of artificial intelligent systems that are enabled by light signals. More significantly, LSSTs are fabricated by a facile solution process which can be easily applied to large‐scale samples. Artificial synapses that are enabled by light signals can enable devices with high bandwidth and less interconnection energy loss. The key challenge is to develop light‐stimulated devices that can respond to light signals in a synapse‐like fashion. Here, a facile solution process to fabricate light‐stimulated synaptic transistors based on inorganic halide perovskite quantum dots and organic semiconductors is reported.