Retrieval of charge mobility from apparent charge packet movements in LDPE thin films

¹ Department of Electrical Engineering, Tongji University - Shanghai 201804, China
² Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University - Shanghai 201804, China
³ Laboratoire de Physique et d'Étude des Matériaux (LPEM, UMR 8213), CNRS, Sorbonne Universités, UPMC, PSL Research University, ESPCI-Paris - Paris 75005, France

^(a) yewen.zhang@tongji.edu.cn
^(b) stephane.hole@tongji.edu.cn

Received: 29 November 2016
Accepted: 25 April 2017

Abstract

The charge packet phenomenon observed in polyethylene materials has been reported extensively during the last decades. To explain its movement, Negative Differential Mobility (NDM) theory is a competitive model among several proposed mechanisms. However, as a key concept of this theory, a sufficiently acute relationship between charge mobility and electric field has never been reported until now, which makes it hard to precisely describe the migration of charge packets with this theory. Based on the substantial negative-charge packet observations with a sufficiently by wide electric field range from 15 kV/mm to 50 kV/mm, the present contribution successfully retrieved the negative-charge mobility from the apparent charge packet movements, which reveals a much closer relationship between the NDM theory and charge packet migrations. Back simulations of charge packets with the retrieved charge mobility offer a good agreement with the experimental data.