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首页> 外文期刊>Journal of Applied Physics >Electroluminescence analysis of high efficiency Cu(In,Ga)Se_2 solar cells
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Electroluminescence analysis of high efficiency Cu(In,Ga)Se_2 solar cells

机译：高效Cu（In，Ga）Se_2太阳能电池的电致发光分析

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摘要

We compare the electroluminescence (EL) of polycrystalline ZnO/CdS/Cu(In,Ga)Se_2 heterojunction solar cells with similar band gaps but different open circuit voltages, indicating a difference in the electronic quality of the absorber. Temperature dependent EL measurements reveal that all cells feature transitions from donor-acceptor pair recombination at lower temperature to band to band recombination at higher temperatures. However, the less efficient cells show a longer transition range with donor-acceptor pair recombination still apparent at room temperature. We find further that the part of the room temperature spectrum that is due to band to band transitions in the respective cells is relatively broader than expected from a direct semiconductor with a homogeneous band gap. We analyze this spectral broadening by a model that accounts for band gap fluctuations of the absorber material. The experimental results show that the dominant part of this spectral broadening results from the intentional band gap grading and not from stochastic band gap fluctuations. We show further that the spectral EL emission is linked to the photovoltaic external quantum efficiency by electro-optical reciprocity. In a similar way, the external EL quantum efficiency is related to the open circuit voltage of the device. We verify experimentally that the difference between radiative and measured open circuit voltage determines the EL external quantum efficiency of the solar cell. The best Cu(In,Ga)Se_2 solar cell reaches an external light emitting diode quantum efficiency of around 0.1%.
机译：我们比较了具有相似带隙但具有不同开路电压的多晶ZnO / CdS / Cu（In，Ga）Se_2异质结太阳能电池的电致发光（EL），表明吸收体的电子质量有所不同。与温度有关的EL测量结果表明，所有细胞都具有从较低温度下的供体-受体对重组转变为较高温度下的条带重组的转变。但是，效率较低的细胞显示出更长的过渡范围，在室温下仍明显存在供体-受体对重组。我们进一步发现，由于各个单元中的带到带跃迁而导致的室温频谱部分比具有均匀带隙的直接半导体所预期的相对宽。我们通过考虑吸收材料带隙波动的模型来分析此光谱展宽。实验结果表明，该谱展宽的主要部分是有意的带隙分级而不是随机的带隙波动。我们进一步表明，光谱EL发射通过电光互易性与光伏外部量子效率相关。同样，外部EL量子效率与器件的开路电压有关。我们通过实验验证了辐射电压与实测开路电压之间的差异决定了太阳能电池的EL外部量子效率。最好的Cu（In，Ga）Se_2太阳能电池的外部发光二极管量子效率约为0.1％。

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  • 来源
    《Journal of Applied Physics》 |2007年第10期|p.104510.1-104510.8|共8页
  • 作者

    Thomas Kirchartz; Uwe Rau;

  • 作者单位

    IEF5-Photovoltaik, Forschungszentrum Juelich, 52425 Juelich, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用物理学;计量学;
  • 关键词

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