Flexible Artificial Mechanoreceptor Based on Microwave Annealed Morphotropic Phase Boundary of HfxZr1‐xO2 Thin Film

Author:

Jung Minhyun1,Kim Seungyeob1,Hwang Junghyeon1,Kim Hye Jin2,Kim Yunjeong2,Ahn Jinho3,Jeon Sanghun1ORCID

Affiliation:

1. School of Electrical Engineering Korea Advanced Institute of Science & Technology Daejeon 34141 Republic of Korea

2. Intelligent Components and Sensors Research Section Electronics and Telecommunications Research Institute Daejeon 34129 Republic of Korea

3. Division of Materials Science and Engineering Hanyang University Seoul 04763 Republic of Korea

Abstract

AbstractThe development of artificial tactile receptor systems is important in the fields of prosthetic devices, interfaces for the metaverse, and sensors. A pressure sensor and memory device may be used in this system to replicate the tactile detecting capabilities of human skin. The implementation of systems that take into account mass production and miniaturization is still difficult. Here, a flexible artificial tactile receptor built using conventional semiconductor processes that combine a vertically stacked piezoelectric sensor with neuromorphic memory is presented. As a fundamental component for both sensors and memory, hafnium zirconium oxide (HZO) formed by using semiconductor deposition technique is introduced. Due to its exceptional piezoelectric performance, the morphotropic phase boundary of HZO is studied. The entire materials and processes are highly compatible with conventional semiconductor processes, including microwave annealing‐based low‐temperature crystallization. Even after 10,000 times of bending stress, the sensor and memory constructed on a flexible substrate exhibit consistent pressure detection characteristics over a wide range of 2–25 kPa. The feasibility of the approach is further demonstrated by a deep neural network simulation, which reached 90.8% braille recognition accuracy. Wearable electronics and medical devices are two examples of industrial domains that can use these flexible, exceptionally durable devices.

Funder

National Research Foundation of Korea

Publisher

Wiley

Subject

Electronic, Optical and Magnetic Materials

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