| 초록 |
Recently, the double perovskite Cs2AgInCl6, which has high stability and low toxicity, has been proposed as a potential alternative to Pb-based perovskites. However, the calculated parity-allowed bandgap of Cs2AgInCl6 is 4.25 eV; this wide-bandgap makes it difficult to use as an solar absorber. In this study, we explored the effect of Cu doping on the optical properties of Cs2AgInCl6 double perovskite, particularly in its changes of absorption profile. The Cu-doped sample showed a new absorption peak and broad absorption bands near 930 nm, indicating bandgap reduction. Electron paramagnetic resonance spectroscopy demonstrated that this bandgap reduction effect was due to the Cu doping in the double perovskite, and confirmed that the Cu2+ paramagnetic centers were located on the surface of the nanocrystals (NCs). Finally, we synthesized Cu-doped MCs and observed results similar to those of the NCs, showing that the application range could be expanded to multi-dimensions. |
