分子取向调控对有机太阳电池器件性能的提升  

Improved device performance enabled by optimized molecular orientation in organic solar cells

作　　者：郭丰 钟天 喻康林 雷诗云 张明睿 肖标[1] 胡黎文 王亮[1] GUO Feng;ZHONG Tian;YU Kanglin;LEI Shiyun;ZHANG Mingrui;XIAO Biao*;HU Liwen;WANG Liang(Key Laboratory of Optoelectronic Chemical Materials and Devices(Ministry of Education),School of Optoelectronic Materials&Technology,Jianghan University,Wuhan 430056,China)

机构地区：[1]江汉大学光电材料与技术学院光电化学材料与器件教育部重点实验室,武汉430056

出　　处：《复合材料学报》2022年第5期1986-1994,共9页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52103213,21302064);中央引导地方科技发展专项(2019ZYYD005)。

摘　　要：活性层形貌对有机太阳电池的器件效率有着重要的影响。调控活性层中的分子取向是优化其形貌的方式之一。本文旨在采用Layer-by-Layer(LbL)的方法调控有机太阳电池活性层中分子的取向,进而提升电池器件的效率。通过向电子受体中加入不同的添加剂实现活性层中受体分子(Y6)的取向调节,优化后器件的能量转换效率达到16.2%。利用椭圆偏振光谱和掠入射广角X射线散射(GIWAXS)技术对活性层薄膜进行了表征,结果表明,向受体中加入1,8-二碘辛烷(DIO)作为添加剂后,活性层中的Y6分子倾向水平取向,向受体中加入氯萘(CN)作为添加剂后,Y6分子倾向于垂直取向。电学和光学表征结果表明,Y6的水平取向增加了器件内激子的分离效率,进而提升了器件的能量转换效率。The morphology of the active layer has an important influence on the device efficiency of organic solar cells.Tuning the molecular orientation in the active layer is one of the ways to optimize its morphology.This paper aims to use a Layer-by-Layer(LbL)method to regulate the orientation of molecules in the active layer of organic solar cells,thereby improving the efficiency of cell devices.By adding different additives to the electron acceptor,the orientation of acceptor molecule(Y6)in the active layer is adjusted,and the energy conversion efficiency of the optimized device reaches 16.2%.The active layer films were characterized by ellipsometry and grazing incidence wideangle X-ray scattering(GIWAXS).The results show that after adding 1,8-diiooctane(DIO)as an additive to the receptor,Y6 molecules in the active layer tend to be horizontally oriented,and after adding chloronaphthalene(CN)as an additive to the receptor,Y6 molecules tend to be vertically oriented.The electrical and optical characterization results show that the horizontal orientation of Y6 increases the exciton separation efficiency,and then improves the energy conversion efficiency of the device.

关 键 词：有机太阳电池 逐层沉积 分子取向 椭圆偏振光谱 掠入射广角X射线散射 受体分子(Y6) 

分 类 号：TM914.4[电气工程—电力电子与电力传动]