Sm3+-doped barium borate glasses are investigated for their potential as a superstrate for CdTe solar cells. The influence
of the Sm3+ conversion efficiency and the Sm2O3 doping level on the short circuit current density of a CdTe solar cell is
analyzed. CdTe solar cells with CdS layer thicknesses of 45 and 300 nm are evaluated. A 3.2 mm thick, 2 mol% Sm2O3-
doped glass superstrate enables a relative increase in the short circuit current density of approximately 1.4% and 2.9%
for a 45 and 300 nm CdS buffer layer, respectively, assuming 100% Sm3+ conversion efficiency.
Neodymium-doped barium borate glasses are investigated for their potential as fluorescent concentrators for the near
infrared spectral range. Additional doping of the glasses with silver oxide and subsequent heat treatment leads to a reduction
of the doped silver ions and to the formation of metallic silver nanoparticles. The formation of the silver nanoparticles
is indicated by a broad surface plasmon-related extinction band at approximately 410 nm. The influence of the
silver nanoparticles on the fluorescence properties is investigated.
Borate glasses and borate glass ceramics are good candidates as a matrix material for fluorescent ions like samarium.
The chosen network modifier influences the fluorescence efficiency of the incorporated rare earth ion. Sm3+-doped lithium,
sodium, barium and lead borate glasses were examined with respect to their fluorescence properties and potential
use as a down-converting top layer of a solar cell.
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