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Tunable flexible artificial synapses: a new path toward a wearable electronic system
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).ORCID iD: 0000-0002-1768-1071
Fudan University, SIST, State Key Laboratory of ASIC and System.
KTH, School of Electrical Engineering and Computer Science (EECS).
Fudan University, SIST, State Key Laboratory of ASIC and System.
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2018 (English)In: npj Flexible Electronics, ISSN 2397-4621, Vol. 2, no 20Article in journal, Editorial material (Refereed) Published
Abstract [en]

The flexible electronics has been deemed to be a promising approach to the wearable electronic systems. However, the mismatching between the existing flexible devices and the conventional computing paradigm results an impasse in this field. In this work, a new way to access to this goal is proposed by combining flexible devices and the neuromorphic architecture together. To achieve that, a high-performance flexible artificial synapse is created based on a carefully designed and optimized memristive transistor. The device exhibits high-performance which has near-linear non-volatile resistance change under 10,000 identical pulse signals within the 515% dynamic range, and has the energy consumption as low as 45 fJ per pulse. It also displays multiple synaptic plasticity features, which demonstrates its potential for real-time online learning. Besides, the adaptability by virtue of its three-terminal structure specifically contributes its improved uniformity, repeatability, and reduced power consumption. This work offers a very viable solution for the future wearable computing.

Place, publisher, year, edition, pages
2018. Vol. 2, no 20
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-235721DOI: 10.1038/s41528-018-0033-1OAI: oai:DiVA.org:kth-235721DiVA, id: diva2:1252995
Note

QC 20181129

Available from: 2018-10-03 Created: 2018-10-03 Last updated: 2018-11-29Bibliographically approved
In thesis
1. Flexible Electrical and Photoelectrical Artificial Synapses for Neuromorphic Systems
Open this publication in new window or tab >>Flexible Electrical and Photoelectrical Artificial Synapses for Neuromorphic Systems
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Over the past decade, the field of personal electronic systems has trended toward mobile and wearable devices. However, the capabilities of existing electronic systems are overwhelmed by the computing demands at the wearable sensing stage. Two main bottlenecks are encountered. The first bottleneck is located within the computing module, between the processing units and the memory, and is known as the von-Neumann bottleneck. The second bottleneck is located between the sensing module and the computing module of the system.

Inspired by neuromorphic computing, an architecture of the sensitive neuromorphic network (SNN) is developed as a candidate for overcoming both bottlenecks. Suitable building blocks, especially in flexible form, must be developed. In this work, starting from the demand analysis and followed by prototype development, performance optimization, and feasibility testing, two kinds of critical devices were developed for fabricating a photosensitive neuromorphic network (PSNN).

A high-performance flexible electrical artificial synapse that is based on the electron-trapping mechanism was developed. In addition to the basic memristive features, multiple kinds of synaptic plasticity were also demonstrated, which enriched the collection of possible applications. Furthermore, optimization on multiple performance metrics was easily performed using the intrinsic features and structure of the device.

A new photoelectrical artificial synapse was also realized by successfully combining light signal sensing and processing in a single synapse. A flexible dual-mode photoelectrical synapse, which fulfilled the requirements of the designed PSNN working protocol, was demonstrated. The device showed gate-tunable photomemristive features, thereby enabling its application as a photoelectrical artificial synapse.

Using the newly developed devices and the proposed network architecture, this work successfully initiated a new area of research, namely, the sensitive neuromorphic network, and provided a valid solution that addresses the current limitations of existing wearable electronic systems.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2018. p. 58
Series
TRITA-CBH-FOU ; 2018:46
Keywords
Flexible electronics, Neuromorphic network, Memristor, Electron trapping, Electrical artificial synapse, Photoelectrical artificial synapse
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Applied Medical Technology
Identifiers
urn:nbn:se:kth:diva-235742 (URN)978-91-7729-979-0 (ISBN)
Public defence
2018-10-31, T2, Hälsovägen 11C, Huddinge, 09:00 (English)
Opponent
Supervisors
Note

QC 20181008

Available from: 2018-10-08 Created: 2018-10-08 Last updated: 2018-10-08Bibliographically approved

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Zheng, Li-rongSeoane, Fernando

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