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Determination of the Electrical Parameters of Iodine-Doped Polymer Solar Cells at the Macro- and Nanoscale for Indoor Applications

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  • Marcin Palewicz

    (Department of Nanometrology, Faculty of Electronics, Photonics and Microsystem, Wroclaw University of Science and Technology, Janiszewskiego 11/17, 50-372 Wroclaw, Poland)

  • Andrzej Sikora

    (Department of Nanometrology, Faculty of Electronics, Photonics and Microsystem, Wroclaw University of Science and Technology, Janiszewskiego 11/17, 50-372 Wroclaw, Poland)

  • Tomasz Piasecki

    (Department of Nanometrology, Faculty of Electronics, Photonics and Microsystem, Wroclaw University of Science and Technology, Janiszewskiego 11/17, 50-372 Wroclaw, Poland)

  • Ewelina Gacka

    (Department of Nanometrology, Faculty of Electronics, Photonics and Microsystem, Wroclaw University of Science and Technology, Janiszewskiego 11/17, 50-372 Wroclaw, Poland)

  • Paweł Nitschke

    (Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34 M. Curie-Skłodowska Str., 41-819 Zabrze, Poland)

  • Paweł Gnida

    (Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34 M. Curie-Skłodowska Str., 41-819 Zabrze, Poland)

  • Bożena Jarząbek

    (Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34 M. Curie-Skłodowska Str., 41-819 Zabrze, Poland)

  • Teodor Gotszalk

    (Department of Nanometrology, Faculty of Electronics, Photonics and Microsystem, Wroclaw University of Science and Technology, Janiszewskiego 11/17, 50-372 Wroclaw, Poland)

Abstract

In this work, macro- and nanodiagnostic procedures for working, third-generation photovoltaic devices based on a modified polymer:fullerene (P3HT:PCBM) absorber were conducted using atomic force microscopy (AFM) and impedance spectroscopy (IS) equipment. All experiments were performed both in the dark and under irradiation with a specific light wavelength. Photoactive Kelvin probe force microscopy (p-KPFM) and impedance spectroscopy (p-IS) experiments were conducted on half- and whole-solar cell devices. Based on the p-KPFM measurements, the surface potential (SP) and surface photovoltage (SPV) on top of the active layer at the micro/nanoscale were estimated for various light wavelengths (red, green, blue, and white). For light in the red spectrum range, which was associated with an optical absorption edge and acceptor states that occurred in the band gap of the P3HT material after doping the donor polymer with iodine, the SPV was measured at levels of 183 mV, 199 mV, and 187 mV for the samples with 0%, 5% and 10% iodine doping, respectively. In addition, a macroscale investigation enabling the determination of the electrical parameters of the studied organic solar cells (OSCs) was carried out using p-IS. Based on the data obtained during p-IS experiments, it was possible to propose a series electrical equivalent circuit to define and describe the charge transfer phenomenon in the OSCs. Estimations of data obtained from the fitting of the experimental results of p-IS under white light allowed us to evaluate the average diffusion time of electric charges at 8.15 µs, 16.66 µs, and 24.15 µs as a function of organic layer thickness for the device without doping and with 5% and 10% iodine doping. In this study, we demonstrated that correlating information obtained at the macro- and nanoscale enabled a better understanding of the electrical charge distribution of OSCs for indoor applications.

Suggested Citation

  • Marcin Palewicz & Andrzej Sikora & Tomasz Piasecki & Ewelina Gacka & Paweł Nitschke & Paweł Gnida & Bożena Jarząbek & Teodor Gotszalk, 2023. "Determination of the Electrical Parameters of Iodine-Doped Polymer Solar Cells at the Macro- and Nanoscale for Indoor Applications," Energies, MDPI, vol. 16(12), pages 1-14, June.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:12:p:4741-:d:1172165
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    1. Athinarayanan Balasankar & Sathya Elango Arthiya & Subramaniyan Ramasundaram & Paramasivam Sumathi & Selvaraj Arokiyaraj & Taehwan Oh & Kanakaraj Aruchamy & Ganesan Sriram & Mahaveer D. Kurkuri, 2022. "Recent Advances in the Preparation and Performance of Porous Titanium-Based Anode Materials for Sodium-Ion Batteries," Energies, MDPI, vol. 15(24), pages 1-16, December.
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