Oxygen-Doped 2D In 2 Se 3 Nanosheets with Extended In-Plane Lattice Strain for Highly Efficient Piezoelectric Energy Harvesting.

Autor: Kim JY; Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea., Hwang W; Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea., Han SY; Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea., Jung YS; Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea.; SK Hynix, Icheon, Gyeonggi-do, 17336, Republic of Korea., Pang F; Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea., Shen W; Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea., Park C; Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea., Kim SW; Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea., Soon A; Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea., Cho YS; Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea.
Jazyk: angličtina
Zdroj: Advanced science (Weinheim, Baden-Wurttemberg, Germany) [Adv Sci (Weinh)] 2024 Nov 26, pp. e2410851. Date of Electronic Publication: 2024 Nov 26.
DOI: 10.1002/advs.202410851
Abstrakt: With the emergence of electromechanical devices, considerable efforts have been devoted to improving the piezoelectricity of 2D materials. Herein, an anion-doping approach is proposed as an effective way to enhance the piezoelectricity of α-In 2 Se 3 nanosheets, which has a rare asymmetric structure in both the in-plane and out-of-plane directions. As the O 2 plasma treatment gradually substitutes selenium with oxygen, it changes the crystal structure, creating a larger lattice distortion and, thus, an extended dipole moment. Prior to the O 2 treatment, the lattice extension is deliberately maximized in the lateral direction by imposing in situ tensile strain during the exfoliation process for preparing the nanosheets. Combining doping and strain engineering substantially enhances the piezoelectric coefficient and electromechanical energy conversion. As a result, the optimal harvester with a 0.9% in situ strain and 10 min plasma exposure achieves the highest piezoelectric energy harvesting values of ≈13.5 nA and ≈420 µW cm -2 under bending operation, outperforming all previously reported 2D materials. Theoretical estimation of the structural changes and polarization with gradual oxygen substitution supports the observed dependence of the electromechanical performance.
(© 2024 The Author(s). Advanced Science published by Wiley‐VCH GmbH.)
Databáze: MEDLINE
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