Organic Solar Cells Based on Ternary Blend Active Layer of Two Donors PTB7, P3HT and Accepter PC₆₁BM

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  • Ohori Yurina
    Department of Precision Machinery Engineering, College of Science and Technology, Nihon University
  • Hoashi Toshihiro
    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
  • Okukawa Takanori
    Department of Precision Machinery Engineering, College of Science and Technology, Nihon University
  • Fujii Shunjiro
    Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • 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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  • Organic Solar Cells Based on Ternary Blend Active Layer of Two Donors PTB7, P3HT and Accepter PC<sub>61</sub>BM

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Bulk-heterojunction solar cells were fabricated using ternary blend dichlorobenzene solutions of 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): poly(3- hexylthiophene)(P3HT):[6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) with different weight ratios between PTB7 and P3HT on an indium-tin-oxide-coated glass substrate. The UV-vis absorption spectra of these ternary blend films show that the photon absorptions at the wave lengths of 500 and 700 nm can be adjusted depending on the P3HT polymer weight fraction in the PTB7 and P3HT total weight. The measurement results of the solar cell performance showed that the open circuit voltage Voc continuously increased from 0.62 to 0.79 V as the P3HT fraction increased from 0 to 20 %, while it gradually decreased above 30%. The short circuit current Jsc slightly decreased from 10.4 to 9.0 A/cm2 up to 20%, and it suddenly dropped above 30%. The power conversion efficiency of 4% decreased to 1.8% when the P3HT fraction increased to 30%. These results may suggest that the transports of photo excited electrons and holes between the PTB7 nano domains and P3HT nano domains are disturbed by the differences between the HOMO and LUMO levels of the PTB7 and P3HT.

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