| 초록 |
To approach the theoretical efficiency of perovskite solar cells (PSCs), the defects in perovskites should be managed. Among different types of defects, halide-vacancies easily form on the surface of perovskite grains (PGs) hindering perovskite stability and charge transport process by trapping charge carriers. In this work, oxidized black phosphorus quantum dots (O-BPQDs) were incorporated into a perovskite to resolve these issues. Oxygen atoms of the O-BPQDs interacted with uncoordinated Pb (halide-vacancies) forming grain interconnections. These interactions reduced halide-vacancies and suppressed the overall recombination kinetics. Along with defect reduction, the O-BPQDs offered an efficient charge transport channel across individual PGs. We achieved best power conversion efficiency (PCE) of 22.34% for SnO2 based PSCs and 23.1% for TiO2 based PSCs. These PSCs exhibited excellent moisture stability in a relative humidity (RH) 40% environment comparable to 3D/2D perovskite. Our strategy provides practical applicability and versatility for PSCs to approach the theoretical PCE value. |
