In this work, a comparative analysis was carried out by using titanium dioxide (TiO2) and tungsten disulfide (WS2) as an electron transport layer (ETL). This numerical analysis was conducted using SCAPS-1D software, which stands for solar cell capacitance simulator-1 Dimensional. The two device structures were: FTO/TiO2/N719/ MoO3 and FTO/WS2/N719/MoO3. For TiO2 ETL-based devices, the PCE was 11.42%, with J sc, V oc, and FF values of 18.50 mA cm−2, 0.872 V, and 70.75%, respectively. By contrast, WS2-based devices achieved a PCE of 14.23% with J sc, V oc, and FF values of 20.86 mA cm−2, 0.880 V, and 77.43%, respectively. Based on the above-mentioned data, WS2 has better PV performance of the solar cell. WS2 exhibits high electron mobility, chemically stable, tunable bandgap, therefore a promising candidate to replace TiO2 as an ETL in future designs. [ABSTRACT FROM AUTHOR]