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

Abstract

This study highlights the significant enhancement of Mo-doped MnSe₂ as an electron transport layer (ETL) for 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 the Mo-doped film, signifying enhanced charge carrier separation. Current density–voltage (J–V) analysis demonstrates a higher power conversion efficiency (21.51%) for Mo-doped 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.