Quantifying Dielectric Material Charge Trapping and De‐Trapping Ability Via Ultra‐Fast Charge Self‐Injection Technique

Author:

Xu Shuyan1,Wang Jian1,Wu Huiyuan1,Zhao Qionghua1,Li Gui1,Fu Shaoke1,Shan Chuncai1,Li Kaixian1,Zhang Zhiyi2,Hu Chenguo1ORCID

Affiliation:

1. Department of Applied Physics Chongqing Key Laboratory of Interface Physics in Energy Conversion Chongqing University Chongqing 400044 P.R. China

2. College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 P. R. China

Abstract

AbstractRecently, utilizing the air breakdown effect in the charge excitation strategy proves as an efficient charge injection technique to increase the surface charge density of dielectric polymers for triboelectric nanogenerators (TENGs). However, quantitative characterization of the ability of dielectric polymers to trap reverse charges and the effect on the startup time of secondary self‐charge excitation (SSCE) are essential for extensive applications. Here, an ultra‐fast charge self‐injection technique based on a self‐charge excitation strategy is proposed, and a standard method to quantify the charge trapping and de‐trapping abilities of 23 traditional tribo‐materials is introduced. Further, the relationship among the distribution of dielectric intrinsic deep, shallow trap states, and transportation of trapped charges is systematically analyzed in this article. It shows that the de‐trapping rate of charges directly determines the reactivation and failure of SSCE. Last, independent of TENG contact efficiency, an ultra‐high charge density of 2.67 mC m−2 and an ultra‐fast startup time of SSCE are obtained using a 15 µm poly(vinylidene fluoride‐trifluoroethylene) film, breaking the historical record for material modification. As a standard for material selection, this work quantifies the charge trapping and de‐trapping ability of the triboelectric dielectric series and provides insights for understanding the charge transport in dielectrics.

Funder

National Natural Science Foundation of China

Fundamental Research Funds for the Central Universities

Publisher

Wiley

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