Abstract
In this study, we successfully prepared Er3+–Yb3+ co-doped TeO2–PbF2 oxyfluoride tellurite glasses with different Yb3+ concentrations and characterized their upconversion properties. Intense emission bands at 527, 544, and 657nm corresponded to the Er3+ transitions, and the maximum was obtained at an Yb3+-to-Er3+ molar ratio of 3. When this glass was applied at the back of amorphous silicon solar cells in combination with a rear reflector, a 0.45% improvement in efficiency was obtained under co-excitation of AM1.5 and 400mW 980nm laser radiation. Maximum external quantum efficiency and luminescence quantum efficiency of 0.27% and 1.35%, respectively, were achieved at 300mW excitation.
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