AI 中文总结
本研究针对TMD单层易受环境与衬底影响致光学性能退化的问题，采用旋涂法制备的COC作为可规模化封装材料，经光谱与理论计算验证其可提升TMD光学性能，为相关器件开发提供了有效封装方案。
AI 中文摘要
单层过渡金属二硫化物（TMD）兼具直接带隙、强束缚激子及显著的二阶光学非线性，是制备超薄光电子与纳米光子器件的极具潜力材料。然而其光学性能常因环境暴露及衬底诱导的电荷捕获而退化，因此需开发可规模化封装策略。本研究探究旋涂法制备的环烯烃共聚物（COC）作为TMD的可规模化封装材料，室温与低温光学光谱显示，封装后光致发光与二次谐波生成增强，伴生激子线宽收窄及激子-三激子比提升；此外COC封装还诱导激子峰分裂与整体光谱蓝移。第一性原理计算表明，光谱修饰分别源于硫族界面处的局域对称性破缺与宏观压应变。这些结果确立了旋涂COC为有效、可规模化的封装策略，且可作为生长后激子与能带结构工程的潜在平台。
英文摘要
Monolayer transition metal dichalcogenides (TMDs) combine a direct bandgap, strongly bound excitons, and pronounced second-order optical nonlinearity, which makes them promising materials for ultrathin optoelectronic and nanophotonic devices. However, their optical performance is often degraded by environmental exposure and substrate-induced charge trapping, motivating the development of scalable encapsulation strategies. Here, we investigate spin-coated cyclic olefin copolymer (COC) as a scalable encapsulant for TMDs. Room-temperature and cryogenic optical spectroscopy reveal enhanced photoluminescence and second-harmonic generation, accompanied by excitonic linewidth narrowing and an increased exciton-to-trion ratio. In addition, COC encapsulation induces an excitonic peak splitting and an overall spectral blueshift. First-principles calculations attribute these spectral modifications to local symmetry breaking at the chalcogen interface and macroscopic compressive strain, respectively. These findings establish spin-coated COC as an effective, scalable encapsulation strategy and a potential platform for post-growth excitonic and band-structure engineering.
