Highly efficient ligand-modified manganese ion doped CsPbCl₃ perovskite quantum dots for photon energy conversion in...

Manganese ion doped CsPbX₃ perovskite quantum dots (QDs) demonstrate high absorption of ultraviolet (UV) light and efficient orange emission with a large Stokes shift, and are almost transparent to visible light, which are ideal photon energy converters for solar cells. In this work, Mn²⁺ ion doped CsPbCl₃ QDs were synthesized by incorporating a long-chain ammonium ligand dodecyl dimethylammonium chloride (DDAC), in which the DDAC ligand not only played the role of replacing the surface ligands of QDs, but also enhanced the efficiency and stability of Mn²⁺ ion doped QDs. The as-prepared QD sample displayed a photoluminescence quantum yield (PLQY) as high as 91% and served as a photon energy converter for silicon solar cells (SSCs). The photoelectric conversion efficiency (PCE) of SSCs increased from 19.64% to 20.65% with a relative enhancement of 5.14%. This work displays a method to tune the efficiency of QDs by modifying the surface ligands and an efficient photon energy converter for SSCs, which is of great importance for practical applications.