Open AccessUnderstanding insulation failure of nanodielectrics: tailoring carrier energy
Author(s) -
Li Shengtao,
Xie Dongri,
Lei Qingquan
Publication year - 2020
Publication title -
high voltage
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.732
H-Index - 20
ISSN - 2397-7264
DOI - 10.1049/hve.2019.0122
Subject(s) - electric field , materials science , charge carrier , chemical physics , trapping , corona (planetary geology) , voltage , scattering , molecular physics , composite material , optoelectronics , chemistry , electrical engineering , optics , physics , ecology , quantum mechanics , astrobiology , venus , biology , engineering
Owing to the formation of interface and new feature of which, the properties of nanodielectrics can be improved. ‘Hard/soft interface’ and its trap distribution can be tailored by functionalised groups. Molecular simulation results show that the interaction energy and electrostatic potential are larger for the soft interface, which indicates the greater bonding strength with the polymer matrix and electrostatic force on charge carriers. Charge transport simulation indicates that the accumulation of homo‐charges would form a reverse electric field and distort electric field distribution. The injection depth would be restricted at the vicinity of sample/electrodes due to the greater trapping effect of deep traps, thus weakening the distortion in the sample bulk, thereby decreasing carrier energy and delaying the formation of impact ionisation. Based on the accumulation of carrier energy Φ = Eeλ , the idea of suppressing electron free path and carrier energy to enhance the insulation breakdown is confirmed. The classified effects of nanofillers during dc breakdown and corona‐resistant are further understood from carrier energy. The introduced interfacial trap is effective in trapping carriers due to the low carrier energy under dc voltage, while ineffective in blocking the energetic charges during corona‐discharge, but nanoparticles exert blocking and scattering effect against the energetic charges.