| Enhancing efficiency of Cs2AgBiBr6 double perovskite solar cells through bandgap reduction by molybdenum doping |
| Ihtisham-ul- haq1, M. I. Khan1, Lamia Ben Farhat2, Habib Elhouichet3, Rajendra P. Patil4 |
1Department of Physics, the University of Lahore, Lahore, 53700, Pakistan
2Department of Chemistry, College of Science, King Khalid University, P.O. Box 9004, 61413, Abha, Saudi Arabia
3Physics Department, College of Sciences, University of Bisha, P.B.551, Bisha, 61922, Saudi Arabia
4Department of Chemistry, M. H. Shinde Mahavidyalaya, Tisangi, Maharashtra, 416206, India |
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Received: May 6, 2024; Revised: August 19, 2024 Accepted: October 5, 2024. Published online: February 4, 2025. |
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| ABSTRACT |
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The thin films of molybdenum (Mo) doped Cs2AgBiBr6 lead-free halide double perovskite solar cells (LFHDPs), were synthesized through a sol–gel method. X-ray diffraction (XRD), UV–Vis spectroscopy, and J–V analysis were used to thoroughly examine the structural, optical, and electrical properties, respectively. XRD confirmed a cubic structure, with Mo doping increasing grain size. UV–Vis spectroscopy indicated a reduced bandgap energy (Eg) to 1.86 eV and a refractive index increase to 2.77. The solar cells fabricated with these films and compared their efficiency. The geometry of the cell is Au/Spiro-OMeTAD/Cs2AgBiBr6/TiO2/FTO/glass. The fabricated Mo-doped solar cell exhibited improved parameters: short circuit current (JSC) of 5.59 mA-cm−2, fill factor (FF) of 0.755, open circuit voltage (VOC) of 0.936 V, and efficiency (η) of 3.95%. This η is 25.39% increased over pristine Cs2AgBiBr6 . This comprehensive characterization suggests that Mo-doped Cs2AgBiBr6 thin films hold the potential for enhanced photovoltaic performance in solar cell applications. |
| Key words:
Cs2AgBiBr6 · Thin film · Solar cells · Halide double perovskite · Doping Mo · Lead-free |
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