非共轭聚合物在有机太阳能电池中的自组装效应  

Self-assembly effect of non-conjugated polymers in organic solar cells

作　　者：魏镇邦 刘升华 WEI Zhenbang;LIU Shenghua(School of Materials,Sun Yat-sen University,Shenzhen 518107,Guangdong,China)

机构地区：[1]中山大学材料学院,广东深圳518107

出　　处：《陕西师范大学学报（自然科学版）》2023年第4期18-27,共10页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：广东省自然科学基金(2022A1515010622);深圳市科技计划(RCBS20200714114922263)。

摘　　要：为简化工艺流程并提高器件效率,利用聚乙烯吡咯烷酮(PVP)的自组装效应,制备了非富勒烯正置有机太阳能电池(organic solar cells,OSCs)的阴极界面层。相比传统的体异质结,通过顺序沉积法制备的准平面异质结活性层结构能更好地发挥PVP的自组装效应。通过接触角、原子力显微镜等表征PVP的自组装迁移方向及过程,并从器件的光强依赖关系分析了PVP影响器件效率的机理。结果表明:在基于准平面异质结构并以PM6:Y6为活性层的有机光伏器件中,引入PVP形成的自组装阴极界面层可使器件的光电转换效率高达11.32%,相比于参考器件其效率提高了25.5%。结果说明对于具有低沸点溶剂的有机太阳能电池,通过准平面异质结活性层结构和非共轭聚合物自组装电子传输层的结合,将获得简单且效率更高的制备工艺。The self-assembly effect of non-conjugated polymers,such as polyvinylpyrrolidone(PVP),can migrate to the surface of the active layer to form the cathode interface layer of non-fullerene positive organic solar cells,aiming to improve device efficiency and simplify the manufacturing process.The quasi-planar heterojunction structure of the active layer prepared by sequential deposition can make better use of the self-assembly effect of PVP additive compared to the traditional bulk heterojunction structures.The direction and process of the self-assembly PVP migration are characterized by the contact angle and atomic force microscopy.In addition,the intrinsic mechanism of PVP affecting the device efficiency is analyzed from the light intensity dependence of the devices.In the OSCs based on quasi-planar heterostructure with PM6:Y6 as the active layer,the self-assembled cathode interface layer formed by introducing PVP,can achieve the highest power conversion efficiency of 11.32%,which is 25.5% higher than that of the reference device.Finally,for high-performance organic solar cells using low boiling point solvents,the combination of quasi-planar heterojunction active layer structure and non-conjugated polymer of self-assembled electron transport layer will be a more effective and convenient fabrication technology.

关 键 词：有机太阳能电池 聚乙烯吡咯烷酮 自组装效应 准平面异质结 非共轭聚合物 

分 类 号：TM914.4[电气工程—电力电子与电力传动]