聚对二甲苯薄膜的制备及其在有机电致发光二极管中的应用研究

Preparation of Parylene-N ultrathin films and their applications in organic light emitting diodes

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0.01 nm/s~0.02 nm/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。

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 -0.02 nm/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.