Abstract
Here, we report for the first time the optical properties of Bi2+ and Tm3+ co-doped germanate glasses and elucidate the potential of this material as substrates to improve the performance of CdTe solar cell. A strong emission peak at 800nm is observed under the excitation of 450–700nm in this material. The energy transfer processes from the transitions of Bi2+ [2P3/2(1)→2P1/2]: Tm3+ [3H6→3H4] are investigated by time-resolved luminescence spectroscopy. A cover glass exhibiting an ultra-broadband response spectrum covering the entire solar visible wavelength region is suggested to enhance the conversion efficiency of CdTe solar cells significantly.
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