【摘要】 使用自制的分子束源制备了聚对二甲苯(Parylene-N,PPXN)薄膜。通过对该分子束源的设计和不断优化,PPXN薄膜可以在室温、10-3 Pa的较低反应压强下以0.01nm/s~0.02nm/s的速率沉积聚合。用红外透射光谱和原子力显微镜测量了PPXN薄膜的成分和表面形貌。结果表明,所制备的薄膜成分为PPXN,薄膜呈波浪状、无尖刺的表面形貌。准确控制的PPXN薄膜在有机电致发光二极管中用作缓冲层,对载流子的注入和传输进行调控,有效地改善了器件内部的载流子平衡。最优化结构的器件较未插入PPXN缓冲层的器件,电流效率提高80%以上。更多还原

【Abstract】 Ultrathin poly-p-xylylene(PPXN)films were prepared by using a home-made Knudsen cell(KC).By special design and optimization of the KC,the growth rate was well controlled in the range of 0.01nm/s-0.02nm/s at room temperature in a relatively lower reaction pressure of 10-3 Pa.The PPXN films were identified by infrared(IR)spectra.The morphology of PPXN films were measured by atomic force microscope(AFM).It was resulted that the PPXN surface showed a spike-free undulated morphology.The well controlled PPXN thin films were used as buffers in organic light emitting diodes to control carrier injection and transport,and improvements of more than 80%in device current efficiency were achieved.更多还原