Tailoring the influence of MnSe2 as an efficient electron transport layer to improve the performance of perovskite solar cells

Abstract

The incorporation of molybdenum (Mo) into manganese selenide (MnSe2) enhances its potential as an electron transport layer (ETL) in perovskite solar cells (PSCs). X-ray diffraction (XRD) confirms a cubic structure with improved crystallinity and increased crystallite size upon Mo doping. Raman spectroscopy reveals phonon mode shifts and reduced defect-induced disorder, indicating structural integrity. Ultraviolet-visible (UV-Vis) spectroscopy shows a redshift in the absorption edge, reducing the optical bandgap from 2.62 eV to 2.56 eV. Photoluminescence (PL) spectra exhibits reduced emission intensity for Mo-doped film, signifying enhanced charge carrier separation. Current density-voltage (J-V) analysis demonstrates a higher power conversion efficiency (21.51%) for Mo-MnSe2-based PSCs due to increased short-circuit current density. Electrochemical impedance spectroscopy (EIS) confirms reduced recombination losses, while external quantum efficiency (EQE) analysis highlights improved charge collection. These findings establish Mo-doped MnSe2 as a superior ETL candidate, enhancing charge transport and stability for high-performance PSCs.