Silver doping of silica-hafnia waveguides containing Tb3+/Yb3+ rare earths for downconversion in PV solar cells

Photoluminescence excitation (left) and emission (right) for Tb(1%)-Yb(4%) codoped glass waveguides before (TY-G) and after Ag introduction (TY-G-A), and after further annealing at 380 °C (TY-G-B) or 440 °C (TY-G-C) for 1 h.195