Tailoring Organic/Inorganic Interface Trap States of Metal Oxide/Polyimide toward Improved Vacuum Surface Insulation

• DOI: 10.1021/acsami.3c07998
• Publication Date: 2023-08-21T04:26:16Z
• Authors: Xiong Yang; Guangyu Sun; Guangzhi Guo; Fangzheng Zou; Wenrui Li; Ruhui Lian; Haoyan Liu; Chao Wang; Haoxiang Zhao; Wendong Li; Baipeng Song; Guanjun Zhang
• Keywords: Trap (plumbing); Arc flash

High-voltage and high-power devices are indispensable in spacecraft for outer space explorations, whose operations require aerospace materials with adequate vacuum surface insulation performance. Despite persistent attempts to fabricate such materials, current efforts restricted trial-and-error methods a universal design guideline is missing. The present work proposes improve the by tailoring trap state density energy level of metal oxides varied bandgaps, using coating on polyimide (PI) substrate, aiming more systematical workflow material design. First-principle calculations diagnostics employed evaluate properties reveal interplay between states flashover threshold, supported dedicated analyses voltage, secondary electron emission (SEE) from insulators, charging behaviors. Experimental results suggest that coated PI (i.e., CuO@PI, SrO@PI, MgO@PI, Al2O3@PI) can effectively increase alter levels. Elevated demonstrated always yield lower SEE. In addition, increasing shallow accelerates charge dissipation, which favorable improving insulation. CuO@PI exhibits most remarkable density, accordingly, highest voltage 42.5% higher than pristine PI. This study reveals critical role played mitigation offers novel strategy optimize materials.