Enhancement of silicon solar cell efficiency by upconversion: Optical and electrical characterization
Enhancement of silicon solar cell efficiency by upconversion: Optical and electrical characterization
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DOI：
10.1063/1.3478742
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发表时间：
2010-08-15
影响因子：
3.2
通讯作者：
Glunz, S. W.
中科院分区：
文献类型：
--
作者：
Fischer, S.;Goldschmidt, J. C.;Glunz, S. W.
子带隙光子的上转换（UC）是通过使子带隙光子也有用来提高太阳能电池效率的有希望的可能性。为此，我们研究了三价铒掺杂的氟化钇钠（NaYF 4：20%Er3+）的材料系统，其显示出适用于硅太阳能电池的高效UC。我们通过校准的光致发光测量来确定光学UC效率。因为这些数据不受与将上变频器应用于太阳能电池相关联的损耗的任何影响，所以所获得的值构成了利用优化的器件可以实现的上限。随后，我们将光学测量的结果与通过使用太阳能电池作为其上应用上转换器材料的检测器所获得的结果进行比较。在1523 nm单色光辐照度为1880 W m（-2）（0.27 cm（2）W-1）时，光学UC量子效率为5.1%。在1522 nm处的辐照度为1090 W·m（-2）（0.03 cm（2）W-1）时，硅太阳能电池和上转换器的外量子效率为0.34%。这些差异是由上转换器太阳能电池器件中发生的光学损耗和上转换器的非线性行为来解释的，所述光学损耗由太阳能电池的透射和上转换层的不完全吸收来支配。(C)2010年美国物理学会。[doi电话：10.1063/1.3478742]
Upconversion (UC) of subband-gap photons is a promising possibility to enhance solar cell efficiency by making also the subband-gap photons useful. For this application, we investigate the material system of trivalent erbium doped sodium yttrium fluoride (NaYF4:20%Er3+), which shows efficient UC suitable for silicon solar cells. We determine the optical UC efficiency by calibrated photoluminescence measurements. Because these data are free from any influence of losses associated with the application of the upconverter to the solar cell, the obtained values constitute the upper limit that can be achieved with an optimized device. Subsequently, we compare the results of the optical measurements with the results obtained by using solar cells as detectors on which the upconverter material is applied. We find an optical UC quantum efficiency of 5.1% at a monochromatic irradiance of 1880 W m(-2) (0.27 cm(2) W-1) at 1523 nm. The device of silicon solar cell and applied upconverter showed an external quantum efficiency of 0.34% at an irradiance of 1090 W m(-2) (0.03 cm(2) W-1) at 1522 nm. The differences are explained by the optical losses occurring in the upconverter solar cell device, which are dominated by the transmission of the solar cell and the incomplete absorption of the upconverting layer, and the nonlinear behavior of the upconverter. (C) 2010 American Institute of Physics. [doi : 10.1063/1.3478742]