Broadband near-infrared quantum cutting by Ce-Yb codoped YAG transparent glass ceramics for silicon solar cells.

Abstract

Ce3+–Yb3+ co-doped transparent glass ceramics containing YAG nanocrystals were prepared by a conventional melt-quenching method. Broadband near infrared quantum cutting was achieved in the glass ceramics and proved to be a cooperative down-conversion process. Under 460 nm excitation, 2F5/2 to 5d1 electronic transitions occurred in Ce3+ and transferred their energy to two neighboring Yb3+. The dependence of the luminescence spectra and decay curves on Yb3+ concentration was investigated to understand the energy transfer mechanism. The energy transfer efficiency and the down-conversion quantum efficiency were estimated to be as high as 77.8% and 177.8%, respectively. This work will open a new route towards increased efficiency in silicon solar cells.