فهرست نشریات علمی دسترسی آزاد ایران

This study investigates the enhancement of power conversion efficiency (PCE) in lead-free CsEuCl3 perovskite solar cells (PSCs) synthesized via the hot-injection method, which ensures precise crystallinity and phase purity. The perovskite layer was doped with carbon quantum dots (CQDs, 1–5 wt%), and the fabricated devices underwent comprehensive morphological (FESEM, XRD, and TEM), optical (UV-Vis), and electrical (J-V) characterizations to evaluate their performance. Optical analysis revealed bandgap reduction (from 1.74 eV to 1.52 eV at 3% CQDs) and enhanced absorption due to improved charge transport and suppressed recombination. Electrical performance peaked at 3% CQDs, achieving a PCE of 1.10% (vs. 0.78% for undoped cells), driven by optimized Jsc (10.5 mA/cm²) and retained Voc (0.34 V). Excessive doping (5% CQDs) induced CQD aggregation, degrading film morphology and performance. These findings underscore CQDs as a promising modifier for tuning optoelectronic properties in rare-earth-based PSCs, while the integrated characterization approach validates the structure-property relationships across all cell components.