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FAGeI2Br/CsGeI2Br: Promising superlattice lead-free perovskite for photovoltaic technology

Author

Listed:
  • Elfatouaki, F.
  • Farkad, O.
  • El Mouncharih, A.
  • Alla, M.
  • Takassa, R.
  • Hassine, S.
  • Giusepponi, S.
  • Ibnouelghazi, E.A.
  • Outzourhit, A.
  • Abouelaoualim, D.

Abstract

This work investigates the structural, optoelectronic, and photovoltaic properties of the lead-free superlattice hybrid Ge-perovskite FAGeI2Br/CsGeI2Br, highlighting its potential for photovoltaic applications. Density Functional Theory (DFT) calculations were employed to optimize the crystal structure and evaluate its bandgap, optical properties, and thermodynamic stability. The results reveal a direct bandgap of 1.50 eV, a low exciton binding energy of 36 meV, and strong absorption in the visible spectrum, indicating the material’s suitability for efficient solar energy conversion. Additionally, numerical simulations using SCAPS-1D were performed to assess the performance of perovskite solar cells (PSCs) incorporating this superlattice as the absorber layer. Device architectures utilizing SnO2 as the electron transport layer (ETL) and Cu2O as the hole transport layer (HTL) achieved a high power conversion efficiency (PCE) of 32.96%. This study provides a solid theoretical foundation for future experimental research on this novel material.

Suggested Citation

  • Elfatouaki, F. & Farkad, O. & El Mouncharih, A. & Alla, M. & Takassa, R. & Hassine, S. & Giusepponi, S. & Ibnouelghazi, E.A. & Outzourhit, A. & Abouelaoualim, D., 2026. "FAGeI2Br/CsGeI2Br: Promising superlattice lead-free perovskite for photovoltaic technology," Renewable Energy, Elsevier, vol. 256(PB).
    • Handle: RePEc:eee:renene:v:256:y:2026:i:pb:s0960148125016854
    DOI: 10.1016/j.renene.2025.124021
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    1. Yusheng Lei & Yuheng Li & Chengchangfeng Lu & Qizhang Yan & Yilei Wu & Finn Babbe & Huaxin Gong & Song Zhang & Jiayun Zhou & Ruotao Wang & Ruiqi Zhang & Yimu Chen & Hsinhan Tsai & Yue Gu & Hongjie Hu , 2022. "Perovskite superlattices with efficient carrier dynamics," Nature, Nature, vol. 608(7922), pages 317-323, August.
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