Cu-Mediated Broadening of the Absorption Band of Quaternary Cu-Ag-In-S/CdSe Type-II Core/Shell Quantum Dot-Sensitized Solar Cells with an Efficiency of 12.51% Under 0.25 Sun

We report the effects of Cu substitution on the photovoltaic performance of (a) single-layered Cu–Ag–In–S and (b) core/shell Cu–Ag–In–S/CdSe quantum-dot sensitized solar cells (QDSSCs).