A simple method to adjust the morphology of gradient three-dimensionalPTB7-Th∶PC71BM polymer solar cells
The multiple interfaces are necessary for exciton separation in bulk heterojunction (BHJ) solar cells and the continuous pathways for carrier transportation in the donor:acceptor blend films,especially along vertical direction, for efficient charge collection.Therefore film morphology is critically important to satisfy both in constructing high performance organic solar cells (OSCs).In this work, cooperative effect of solvent additives and solvent flux treatment to the film morphology was confirmed.Furthermore, the correlation between single processing parameter and resulting morphology has been investigated.Our results show that the film morphology can be tuned by changing the volume fraction of solvent additive.Beyond that,after methanol fluxing, the OSC performance was improved significantly, as short circuit current density (Jsc) increases from 13.85 mA/cm2 to 15.17 mA/cm2 and fill factor (FF) from 62.9% to 65.7%,simultaneously.As a result, power conversion efficiency (PCE) increases from 6.79% to 7.67%.The favorable morphology was further investigated using the time-of-flight secondary-ion mass spectroscopy (TOF-SIMS), the atomic force microscopy (AFM).
Gradient three-dimensional film morphology solvent additive solvent flux multiple interfaces continuous pathways
Ling Zhao Suling Zhao Zheng Xu Qianqian Yang Di Huang Xurong Xu
Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University),Ministry of Education,Beijing,100044,China;Institute of Optoelectronics Technology,Beijing Jiaotong University,Beijing,100044,China
国内会议
广州
英文
61-73
2015-05-01（万方平台首次上网日期，不代表论文的发表时间）