Applied Physics A

, 124:266 | Cite as

Performances and impedance spectroscopy of Small-molecule bulk heterojunction solar cells based on PtOEP: PCBM

  • A. A. Abuelwafa
  • M. Dongol
  • M. M. El-Nahass
  • T. Soga


Small-molecule bulk heterojunction (SBHJ) solar cells based on platinum octaethylporphyrin (PtOEP) as donor material and phenyl-C61-butyric acid methyl ester (PCBM) as the acceptor were fabricated using spin coating techniques with weight ratios from 1:0.1 to 1:9. The formation of charge transfer complex CTC in the PtOEP: PCBM blend was specified from the redshift of the PtOEP absorption peak after blending with PCBM. The photovoltaic performance for PtOEP: PCBM blends were investigated using the external quantum efficiency (EQE) besides the current density–voltage (J–V) characteristics under illumination100 mW/cm2 (AM1.5G). The BHJ solar cell with PtOEP: PCBM ratio of 1:9 exhibited the best performance. The impedance spectroscopy (IS) was examined in the frequency range from 25 Hz to 1 MHz. The equivalent circuit model was evaluated in details to evaluate the impedance spectroscopy parameters. Dielectric constant \({\varepsilon ^\prime }\), dielectric loss \({\varepsilon ^{\prime \prime }}\) and dielectric modulus were included and discussed in terms of dielectric polarization processes. Dielectric modulus displays the non-Debye relaxation in PtOEP: PCBM BHJ solar cells.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • A. A. Abuelwafa
    • 1
    • 3
  • M. Dongol
    • 1
  • M. M. El-Nahass
    • 2
  • T. Soga
    • 3
  1. 1.Nano and Thin film Laboratory, Physics Department, Faculty of ScienceSouth Valley UniversityQenaEgypt
  2. 2.Physics Department, Faculty of EducationAin Shams UniversityCairoEgypt
  3. 3.Department of Electrical and Mechanical EngineeringNagoya Institute of TechnologyNagoyaJapan

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