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有机体相异质结太阳能电池有源层形貌直接影响器件能量转换效率.在聚合物/小分子共混体系中,当小分子尺寸小于聚合物侧链间距时,且与聚合物相互作用能形成基态-电荷转移态复合物时能够形成双分子穿插结构.双分子穿插结构改变了共混体系的薄膜形貌,不利于器件的光电转换过程.本文从双分子穿插结构形成过程入手,论述了双分子穿插行为对共混体系结晶行为及相分离行为的影响,以及对器件光电转换过程中激子扩散与分离及载流子传输等物理过程的影响;详细阐述了现阶段抑制双分子穿插行为的化学、物理方面的主要方法及相关原理.同时,我们进一步提出了该领域尚待解决的问题并对其发展前景进行了展望.
Organic phase heterojunction Solar cell active layer morphology directly affects the device energy conversion efficiency.In the polymer / small molecule blend system, when the small molecule size is smaller than the polymer side chain spacing, and the interaction with the polymer can form The ground state - charge-transfer complex can form a bimolecular interspersed structure.The bimolecular interspersed structure changes the morphology of the blend system, which is not conducive to the photoelectric conversion process.Based on the formation process of bimolecular interspersed structure, The effects of molecular interspersed behavior on the crystallization behavior and phase separation behavior of the blends, and the influence on physical processes such as exciton diffusion and separation and carrier transport in the photoelectric conversion process; and elaborates the current inhibition of bimolecular penetration Chemical and physical methods and related principles.At the same time, we further put forward the problems to be solved in this field and prospected their development prospects.