Crystal-Plane Controlled Spontaneous Polarization of Inorganic Perovskite toward Boosting Triboelectric Surface Charge Density

Xueping Yu; Zhongzhe Liu; Xiya Yang; Yudi Wang; Jihua Zhang; Jialong Duan; Liming Liu; Qunwei Tang

doi:10.1021/acsami.1c05796

Crystal-Plane Controlled Spontaneous Polarization of Inorganic Perovskite toward Boosting Triboelectric Surface Charge Density

ACS Appl Mater Interfaces. 2021 Jun 9;13(22):26196-26203. doi: 10.1021/acsami.1c05796. Epub 2021 May 28.

Authors

Xueping Yu^{1

2}, Zhongzhe Liu², Xiya Yang¹, Yudi Wang¹, Jihua Zhang², Jialong Duan¹, Liming Liu³, Qunwei Tang¹

Affiliations

¹ College of Information Science and Technology, Jinan University, Guangzhou 510632, PR China.
² State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science & Technology of China, Chengdu, Sichuan 610054, PR China.
³ Zhongshan Branch of State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan, Guangdong 528402, PR China.

PMID: 34047548
DOI: 10.1021/acsami.1c05796

Abstract

Triboelectric generators (TENGs) have been extensively studied as a new energy for low cost and the universally applicable prospect. Meanwhile, perovskites have been applied in TENG and show a good performance in view of high carrier mobility, long life and dielectric properties. The asymmetry structure of the orthogonal phase CsPbBr₃ perovskite endows it with ferroelectric property and induces the misalignment of the positive and negative charge centers. Herein, the surface energy of halogen doped inorganic CsPbX₃ (X = Cl^-, Br^-) perovskites are theoretically investigated by density functional theory (DFT) calculation, the crystal polarizability of pristine CsPbBr₃ is improved from 0.47 Ry a.u. to 0.52 Ry a.u. (CsPbCl₃), indicating the polarizability of CsPbCl₃ is higher than CsPbBr₃. In addition, the build-in electric field (E_build-in) of perovskite materials can be enhanced by the spontaneous polarization and the aligned dipoles in the E_build-in could further improve the tribo-electrostatic electric field by retaining more triboelectric surface charges. In the end, CsPbCl₃ achieved a power of 3.06 W m^-2 compared to the power of 1.34 W m^-2 of CsPbBr₃. This work focuses on the regulation of crystal planes using spontaneous polarization of perovskite toward achieving a high built-in electric field for enhancing triboelectric surface charge density.

Keywords: crystal plane regulation; halogen inorganic perovskite; spontaneous polarization; surface energy; triboelectric nanogenerators.