Enhanced performance andMorphological Evolution of PTB7∶PC71BM Polymer Solar Ceils byUsingSolvent Mixtures with Different Additives
Organic photovoltaics (OPVs)were fabricated with blended active layers of poly””4,8-bis”(2-ethylhexyl)oxy”benzo”1,2-b ∶4,5-b”” dithiophene-2,6-diyl” ”3-fluoro-2-”(2-ethyl-hexyl)carbonyl”thieno”3,4-b”thiophenediyl””∶”6,6”-phenylC71-butyric acid methyl ester (PTB7∶PC71BM).The active layers wereprepared in chlorobenzene (CB) with different additives of 1,8-Diiodooctane (DIO) and 1,8-Dibromooctane and different concentrations by a wet process with spin coating.The effects of different solvent additives were studied with respect of photovoltaic parameters such as fill factor, short circuit current density, and power conversion efficiency.The absorption and surface morphology of the active layers wereinvestigated by UV-visible spectroscopy, atomic force microscopy (AFM)and time-of-flight secondary ion mass spectrometer (TOF-SIMS), respectively.The results indicated that structural and morphological changes were induced by the solvent additives.The polymer solar cells(PSCs) of PTB7/PC71BM pre-pared with DIO and1,8-Dibromooctane showed more improved PCE of 6.76% by spin coating method.The enhancement of performance of PSCs could be mainly attributed to the absorption enhancement and the improved charge carrier transportation.
DIO 1,8-dibromooctane PCE
Di Huang Yang Li Zheng Xu Suling Zhao Ling Zhao Jiao Zhao
Key Laboratory of Luminescence and Optical Information,Beijing Jiaotong University,Ministry of Education,Beijing 100044,PR China;Institute of Optoelectronic Technology,Beijing Jiaotong University,Beijing 100044,PR China
国内会议
广州
英文
187-200
2015-05-01（万方平台首次上网日期，不代表论文的发表时间）