Dielectric capacitors are essential for the effective and dependable performance of new energy electronic circuits. However, energy storage dielectric materials still face significant challenges, including low energy density and poor thermal stability. In this study, polyetherimide (PEI), a high-temperature-resistant material, is selected as the subject of investigation. A bifunctional three-layer structure is designed to effectively regulate charge carriers. The structure consists of a scattering electron layer (4-NB/PEI) containing 4-(dimethylamino)phenylboronic acid (4-NB) and a trapping electron layer (F