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Published on: September 12, 2014
Reducing non-radiative recombination energy loss via a fluorescence intensifier for efficient and stable ternary
Xuan Liu1, Yang Liu, Yongfeng Ni
1State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Zhongshan Road 457, Dalian 116023, P. R. China. guoxin@dicp.ac.cn canli@dicp.ac.cn.
Abstract:
Increasing electroluminescene quantum efficiency (EQEEL) of the photoactive layer to reduce non-radiative recombination energy loss (Eloss) has been demonstrated as an effective strategy to improve open-circuit voltage (Voc) of organic solar cells (OSCs). Meanwhile, incorporating a third component into the active-layer film can improve power conversion efficiency (PCE) of resultant ternary OSCs, mostly contributed from increments in short-circuit current density and fill factor but less in the Voc. Herein, we report a highly fluorescent molecule (IT-MCA) as a third component to reduce the Eloss and enhance the Voc for ternary OSCs. Applying the IT-MCA to three binary hosts, a significant increase of Voc (41 mV) is acquired and a best PCE of 16.7% is obtained with outstanding device stability. This work provides a new guideline to design the third-component molecule by enhancing its fluorescence for efficient and stable ternary OSCs with improved Voc.
