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Progress on up- and down-converted fluorescence in rare-earth doped fluorozirconate-based glass ceramics for high efficiency solar cells

机译:稀土掺杂氟锆酸盐基高效太阳能电池玻璃陶瓷的上下转换荧光研究进展

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Transparent glasses as up- or down-converters are attractive systems to increase the efficiency of solar cells. Er-doped fluorozirconate (FZ) glasses show an intense up-conversion upon excitation at 1540 nm. Transmission spectra show that the absorbance at 1540 nm grows linearly with the Er-doping level. In Eu-doped FZ glasses, which were additionally doped with chlorine ions, the growth of BaCl_2 nanocrystals can be observed upon thermal annealing. For high annealing temperatures a phase change from hexagonal to orthorhombic phase BaCl_2 can be seen. Upon excitation in the ultraviolet (UV) spectral range these glass ceramics emit an intense blue emission. A combination of a silicon solar cell and an Eu-doped FZ glass ceramic as a down-converting top layer shows an increase in the short circuit current in the UV spectral range compared to a solar cell without a down-converting top layer.
机译:透明玻璃作为上变频器或下变频器是吸引人的系统,可以提高太阳能电池的效率。掺的氟锆酸盐(FZ)玻璃在1540 nm激发时显示出强烈的上转换。透射光谱表明,在1540 nm处的吸光度随Er掺杂水平线性增长。在另外掺有氯离子的掺Eu的FZ玻璃中,通过热退火可以观察到BaCl_2纳米晶体的生长。对于高退火温度,可以看到从六方相到正交晶相BaCl_2的相变。在紫外线(UV)光谱范围内激发后,这些玻璃陶瓷会发出强烈的蓝光。与没有下转换顶层的太阳能电池相比,硅太阳能电池和Eu掺杂的FZ玻璃陶瓷的组合作为下转换顶层显示出在UV光谱范围内的短路电流增加。

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