Charge Injection and Dielectric Characteristics of Polyethylene Terephthalate Based on Semiconductor Electrodes

Abstract

Employing a novel semiconductor electrode in comparison with the traditional semiconductor electrode made of polyethylene/ethylene-vinyl-acetate copolymer/carbon-black (PE/EVA/CB) composite, characteristic charge carriers are injected into polyethylene terephthalate (PET) as a polymer dielectric paradigm, which will be captured by specific deep traps of electrons and holes. Combined with thermal stimulation current (TSC) experiments and first-principles electronic-state calculations, the injected charges from the novel electrode are characterized, and the corresponding dielectric behavior is elucidated through DC conductance, electrical breakdown and dielectric spectrum tests. TSC experiments with novel and traditional semiconductor electrodes can distinguish the trapping characteristics between hole and electron traps in polymer dielectrics. The observable discrepancy in space charge-limited conductance and the stable dielectric breakdown strength demonstrate that the electron injection into PET film specimen is restricted by using the novel semiconductor electrode. Attributed to the favorable suppression on the inevitable electron injections from metal electrodes, adopting novel i-electrode can avoid the evident abatement of dipole orientation polarization caused by space charge clamp, but will engender the accessional high-frequency dielectric loss from dielectric relaxations of interface charges at i-electrodes.

Mylar Interlayer-Mediated Performance Enhancement of a Flexible Triboelectric Nanogenerator for Self-Powered Pressure Sensing Application

“…This recombination hinders charge retention in the triboelectric material and causes sharp degradation in output performance of TENGs. Here, BoPET is used as an interlayer between the triboelectric material and the electrode, which acts as a charge transition-blocking layer which improves the charge retention ability of the triboelectric material by blocking charge recombination . In the triboelectric process, BoPET plays no role in the friction process to generate triboelectric charges but rather participates in charge transitions and the blocking process.…”

“…Here, BoPET is used as an interlayer between the triboelectric material and the electrode, which acts as a charge transitionblocking layer which improves the charge retention ability of the triboelectric material by blocking charge recombination. 48 In the triboelectric process, BoPET plays no role in the friction process to generate triboelectric charges but rather participates in charge transitions and the blocking process. Since, the carrier mobility (10 −15 m 2 /Vs) 49 and the thickness (∼85 μm) of BoPET are higher than those of both the triboelectric materials, it can effectively block the triboelectric charge decay by preventing the recombination with the interfacial charges on the electrode.…”

Acrylate and Methacrylate Polymers’ Applications: Second Life with Inexpensive and Sustainable Recycling Approaches

“…Polymers represent one of the most promising candidates thanks to their high strength-to-weight ratio, stiffness, toughness, ductility and cost/effectiveness [ 13 , 14 , 15 , 16 ]. Moreover, they have a wide range of operating temperatures, high thermal/electrical insulation, good resistance to both corrosion and light.…”