Na incorporation into Cu(In,Ga)Se2 for high-efficiency flexible solar cells on polymer foils
Na incorporation into Cu(In,Ga)Se2 for high-efficiency flexible solar cells on polymer foils
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DOI：
10.1063/1.1857059
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发表时间：
2005-03
影响因子：
3.2
通讯作者：
D. Rudmann;D. Bremaud;H. Zogg;A. Tiwari
中科院分区：
文献类型：
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作者：
D. Rudmann;D. Bremaud;H. Zogg;A. Tiwari
在薄膜太阳能电池的铜(In，Ga)Se2(CIGS)吸收材料中掺入少量的钠可以提高转换效率。通常，钠的添加方式是在CIGS生长过程中存在的，并因此影响生长动力学。我们已经将沉积后的钠内扩散用于原生的、无钠的吸收材料中，并观察到典型的效率提高。这表明，总体上，主要的正Na效应来自于电子吸收层性质的改变，而不是CIGS生长动力学的修正。在较低的衬底温度下，Na阻碍了CIGS相的形成。这可能解释了为什么在衬底温度低于450°C的情况下，在Na存在的情况下生长的吸收体产生的细胞比沉积后处理的CIGS更差。我们已经开发了用于在聚酰亚胺衬底上加工柔性CIGS太阳能电池的后沉积Na掺杂。独立测量了AM1.5标准测试条件下的转换效率为14.1%。太.。
Incorporation of a small amount of sodium into Cu(In,Ga)Se2 (CIGS) absorbers for thin-film solar cells is well known to enhance conversion efficiencies. Usually, Na is added in a way such that it is present during CIGS growth and therewith influences the growth kinetics. We have used post-deposition Na in-diffusion into as-grown, Na-free absorbers and observed typical efficiency improvements. This suggests that in general the main positive Na effect originates from changes in the electronic absorber properties rather than from modification of CIGS growth kinetics. At low substrate temperatures, Na impedes CIGS phase formation. This may explain why absorbers grown at substrate temperatures below 450°C in the presence of Na yield inferior cells compared with post-deposition-treated CIGS. We have developed post-deposition Na incorporation for the processing of flexible CIGS solar cells on polyimide substrates. A conversion efficiency of 14.1% under AM1.5 standard test conditions was independently measured. T...