Organic Solar Cells Based on PTB7:PC₇₁BM with Cs₂CO₃ as a Cathode Buffer Layer

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  • Kaneto Daichi
    Department of Precision Machinery Engineering, College of Science and Technology, Nihon University
  • Yanagidate Tatsuki
    Department of Precision Machinery Engineering, College of Science and Technology, Nihon University
  • Yanagi Yuichiro
    Department of Precision Machinery Engineering, College of Science and Technology, Nihon University
  • Fujii Shunjiro
    Department of Precision Machinery Engineering, College of Science and Technology, Nihon University
  • Kataura Hiromichi
    Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • Nishioka Yasushiro
    Department of Precision Machinery Engineering, College of Science and Technology, Nihon University

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タイトル別名
  • Organic Solar Cells Based on PTB7:PC<sub>71</sub>BM with Cs<sub>2</sub>CO<sub>3</sub> as a Cathode Buffer Layer

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Bulk heterojunction solar cells were fabricated using poly[[4,8-bis[(2-ethylhexyl)oxy]benzo [1,2-b:4,5-b']dithiophene-2,6-diyl] [3-fluoro-2- [(2-ethylhexyl)carbonyl]thieno[3,4-b]-thiophenediyl] (PTB7) and [6,6]-phenyl C71 butyric acid methyl ester (PC71BM) after a layer of poly(3,4- ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) was deposited on an indium tin oxide (ITO)-coated glass substrate. The fabricated structures were glass/ITO/PEDOT:PSS/PTB7:PC71BM/Cs2CO3/Al with or without the cesium carbonate (Cs2CO3) buffer layer, and the effect of the buffer layer on the performance of the solar cells was investigated. The Cs2CO3 layer with a thickness of 0.8 nm significantly increased the short circuit current density, open-circuit voltages and fill factors of the solar cells, presumably because of the better contact between the active layer and the cathode and the work function shift of the aluminum cathode. As a result, the power conversion efficiency increased from 1.09 to 2.12%. However, when thickness of the Cs2CO3 exceeded 2 nm, significant degradation was observed. From the results of a stability test, it was suggested that the inserted Cs2CO3 layer had a minimal influence on the lifetime of the unpakcaged devices.

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