Giant pyroelectricity in nanomembranes

Jie Jiang (), Lifu Zhang, Chen Ming, Hua Zhou, Pritom Bose, Yuwei Guo, Yang Hu, Baiwei Wang, Zhizhong Chen, Ru Jia, Saloni Pendse, Yu Xiang, Yaobiao Xia, Zonghuan Lu, Xixing Wen, Yao Cai, Chengliang Sun, Gwo-Ching Wang, Toh-Ming Lu, Daniel Gall, Yi-Yang Sun, Nikhil Koratkar, Edwin Fohtung, Yunfeng Shi () and Jian Shi ()
Additional contact information
Jie Jiang: Rensselaer Polytechnic Institute
Lifu Zhang: Rensselaer Polytechnic Institute
Chen Ming: Chinese Academy of Sciences
Hua Zhou: Argonne National Laboratory
Pritom Bose: Rensselaer Polytechnic Institute
Yuwei Guo: Rensselaer Polytechnic Institute
Yang Hu: Rensselaer Polytechnic Institute
Baiwei Wang: Rensselaer Polytechnic Institute
Zhizhong Chen: Rensselaer Polytechnic Institute
Ru Jia: Rensselaer Polytechnic Institute
Saloni Pendse: Rensselaer Polytechnic Institute
Yu Xiang: Rensselaer Polytechnic Institute
Yaobiao Xia: Rensselaer Polytechnic Institute
Zonghuan Lu: Rensselaer Polytechnic Institute
Xixing Wen: Rensselaer Polytechnic Institute
Yao Cai: Wuhan University
Chengliang Sun: Wuhan University
Gwo-Ching Wang: Rensselaer Polytechnic Institute
Toh-Ming Lu: Rensselaer Polytechnic Institute
Daniel Gall: Rensselaer Polytechnic Institute
Yi-Yang Sun: Chinese Academy of Sciences
Nikhil Koratkar: Rensselaer Polytechnic Institute
Edwin Fohtung: Rensselaer Polytechnic Institute
Yunfeng Shi: Rensselaer Polytechnic Institute
Jian Shi: Rensselaer Polytechnic Institute

Nature, 2022, vol. 607, issue 7919, 480-485

Abstract: Abstract Pyroelectricity describes the generation of electricity by temporal temperature change in polar materials1–3. When free-standing pyroelectric materials approach the 2D crystalline limit, how pyroelectricity behaves remained largely unknown. Here, using three model pyroelectric materials whose bonding characters along the out-of-plane direction vary from van der Waals (In2Se3), quasi-van der Waals (CsBiNb2O7) to ionic/covalent (ZnO), we experimentally show the dimensionality effect on pyroelectricity and the relation between lattice dynamics and pyroelectricity. We find that, for all three materials, when the thickness of free-standing sheets becomes small, their pyroelectric coefficients increase rapidly. We show that the material with chemical bonds along the out-of-plane direction exhibits the greatest dimensionality effect. Experimental observations evidence the possible influence of changed phonon dynamics in crystals with reduced thickness on their pyroelectricity. Our findings should stimulate fundamental study on pyroelectricity in ultra-thin materials and inspire technological development for potential pyroelectric applications in thermal imaging and energy harvesting.

Date: 2022
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DOI: 10.1038/s41586-022-04850-7

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