A freestanding ferroelectric thin film-based soft strain sensor

Jianping Guo; Zelong Wang; Guo Tian; Deyang Chen; Xingsen Gao; Xiaoyuan Zhou; Jiangyu Li; Ji-Yan Dai

Journal of Materiomics (Jan 2025)

A freestanding ferroelectric thin film-based soft strain sensor

Jianping Guo,
Zelong Wang,
Guo Tian,
Deyang Chen,
Xingsen Gao,
Xiaoyuan Zhou,
Jiangyu Li,
Ji-Yan Dai

Affiliations

Jianping Guo: Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China; South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, Guangdong, China
Zelong Wang: Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
Guo Tian: Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China; South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, Guangdong, China; Corresponding author. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
Deyang Chen: South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, Guangdong, China
Xingsen Gao: South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, Guangdong, China
Xiaoyuan Zhou: College of Physics, Chongqing University, Chongqing, 401331, China; Corresponding author.
Jiangyu Li: Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, China
Ji-Yan Dai: Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China; Corresponding author.

Journal volume & issue: Vol. 11, no. 1
p. 100830

Abstract

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Flexoelectric and photo-flexoelectricity are scientifically intriguing and hold considerable potential for various applications such as soft strain sensing, photovoltaics, energy harvesting, etc. Among flexoelectric materials, freestanding ferroelectric thin films are believed to have huge flexoelectricity and tunability due to their excellent lattice regulatory freedom and sustainability to larger strain gradients. In this work, we demonstrated a freestanding BiFeO3(BFO) thin film-based soft strain sensor and explored their flexoelectric coefficient and flexoelectric photovoltaic effect under different strain gradients. Under different bending scales, the photocurrent of the thin film exhibits a step-like variation, indicating that the sensor can measure strain gradient with high sensitivity. These results show the potential application of freestanding ferroelectric films in flexible devices.

Published in Journal of Materiomics

ISSN: 2352-8478 (Print); 2352-8486 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.sciencedirect.com/journal/journal-of-materiomics

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