Bond engineering of molecular ferroelectrics renders soft and high-performance piezoelectric energy harvesting materials

Yuzhong Hu (), Kaushik Parida, Hao Zhang, Xin Wang, Yongxin Li, Xinran Zhou, Samuel Alexander Morris, Weng Heng Liew, Haomin Wang, Tao Li, Feng Jiang, Mingmin Yang, Marin Alexe, Zehui Du, Chee Lip Gan, Kui Yao, Bin Xu, Pooi See Lee () and Hong Jin Fan ()
Additional contact information
Yuzhong Hu: Nanyang Technological University
Kaushik Parida: Nanyang Technological University
Hao Zhang: Nanyang Technological University
Xin Wang: Soochow University
Yongxin Li: Nanyang Technological University
Xinran Zhou: Nanyang Technological University
Samuel Alexander Morris: Nanyang Technological University
Weng Heng Liew: A*STAR (Agency for Science, Technology and Research)
Haomin Wang: Nanyang Technological University
Tao Li: Nanyang Technological University
Feng Jiang: Nanyang Technological University
Mingmin Yang: The University of Warwick
Marin Alexe: The University of Warwick
Zehui Du: Nanyang Technological University
Chee Lip Gan: Nanyang Technological University
Kui Yao: A*STAR (Agency for Science, Technology and Research)
Bin Xu: Soochow University
Pooi See Lee: Nanyang Technological University
Hong Jin Fan: Nanyang Technological University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Piezoelectric materials convert mechanical stress to electrical energy and thus are widely used in energy harvesting and wearable devices. However, in the piezoelectric family, there are two pairs of properties that improving one of them will generally compromises the other, which limits their applications. The first pair is piezoelectric strain and voltage constant, and the second is piezoelectric performance and mechanical softness. Here, we report a molecular bond weakening strategy to mitigate these issues in organic-inorganic hybrid piezoelectrics. By introduction of large-size halide elements, the metal-halide bonds can be effectively weakened, leading to a softening effect on bond strength and reduction in polarization switching barrier. The obtained solid solution C6H5N(CH3)3CdBr2Cl0.75I0.25 exhibits excellent piezoelectric constants (d33 = 367 pm/V, g33 = 3595 × 10−3 Vm/N), energy harvesting property (power density is 11 W/m2), and superior mechanical softness (0.8 GPa), promising this hybrid as high-performance soft piezoelectrics.

Date: 2022
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DOI: 10.1038/s41467-022-33325-6

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