Enhanced Charge Transport in Inverted Perovskite Solar Cells via Electrodeposited La-Modified NiO x Layers

Lina Aristizábal-Duarte, Martín González-Hernández, Sergio E. Reyes, J. A. Ramírez-Rincón, Pablo Ortiz and María T. Cortés ()
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Lina Aristizábal-Duarte: Department of Chemistry, Universidad de los Andes, Bogotá 111711, Colombia
Martín González-Hernández: Department of Chemistry, Universidad de los Andes, Bogotá 111711, Colombia
Sergio E. Reyes: Department of Chemical Engineering, Universidad de los Andes, Bogotá 111711, Colombia
J. A. Ramírez-Rincón: Grupo de Investigación en Ciencias y Educación, Facultad de Ingeniería, Universidad de América, Bogotá 111211, Colombia
Pablo Ortiz: Department of Chemical Engineering, Universidad de los Andes, Bogotá 111711, Colombia
María T. Cortés: Department of Chemistry, Universidad de los Andes, Bogotá 111711, Colombia

Energies, 2025, vol. 18, issue 14, 1-25

Abstract: This work explored an electrochemical approach for synthesizing lanthanum-modified nickel oxide (NiO x :La) as a hole transport layer (HTL) in inverted perovskite solar cells (IPSCs). By varying the La 3+ concentration, the chemical, charge transport, structural, and morphological properties of the NiO x :La film and the HTL/PVK interface were evaluated to enhance photovoltaic performance. X-ray photoelectron spectroscopy (XPS) confirmed La 3+ incorporation, a higher Ni 3+ /Ni 3+ ratio, and a valence band shift, improving p-type conductivity. Electrochemical impedance spectroscopy and Mott–Schottky analyses indicated that NiO x :La 0.5% exhibited the lowest resistance and the highest carrier density, correlating with higher recombination resistance. The NiO x :La 0.5% based cell achieved a PCE of 20.08%. XRD and SEM confirmed no significant changes in PVK structure, while photoluminescence extinction demonstrated improved charge extraction. After 50 days, this cell retained 80% of its initial PCE, whereas a pristine NiO x device retained 75%. Hyperspectral imaging revealed lower optical absorption loss and better homogeneity. These results highlight NiO x :La as a promising HTL for efficient and stable IPSCs.

Keywords: inverted perovskite solar cells; lanthanum-modified nickel oxide; HTL; electrodeposition (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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