Simulation results, as illustrated in Fig. , reveal that the efficiency (η) of the device decreases with increasing Rs, while the open-circuit voltage (Voc) shows a slight upward trend. Under ideal conditions, with Rs=0Ω, the efficiency reaches its maximum value of 27.87%. However, when Rs increases to 6 Ω, the efficiency declines to 23.31%, while Voc stabilizes around 1.1 V. This decline is attributed to increased resistive losses within the device, which impede efficient charge collection .