A 19.8% efficient honeycomb multicrystalline silicon solar cell with improved light trapping
A 19.8% efficient honeycomb multicrystalline silicon solar cell with improved light trapping
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DOI：
10.1109/16.791985
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发表时间：
1999-10
影响因子：
3.1
通讯作者：
Jianhua Zhao;Aihua Wang;P. Campbell;M. Green
中科院分区：
文献类型：
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作者：
Jianhua Zhao;Aihua Wang;P. Campbell;M. Green
本文报道了一种多晶硅太阳电池的效率大幅度提高，达到19.8%。这是迄今报道的多晶硅电池的最高效率。多晶电池性能的改善源于将电池表面覆盖在热生长的氧化物中以减少其有害的电子活性，以及通过各向同性腐蚀形成六角对称的蜂窝表面织构。这种纹理主要是倒置的半球，通过有效地充当随机发生器，减少了反射损失并改善了对红外光的吸收。给出了光线跟踪模型的结果，其中值得注意的是，在前两次通过后，高达90%的红外光被捕获在衬底中，而众所周知的倒金字塔结构只有65%。这些光学特性被认为是导致38.1 mA/cm/sup 2/的异常高的短路电流密度的原因。通过对这些蜂窝单元使用欠刻蚀井，有望得到进一步的改进。
This paper reports a substantially improved efficiency for a multicrystalline silicon solar cell of 19.8%. This is the highest ever reported efficiency for a multicrystalline silicon cell. The improved multicrystalline cell performance results from enshrouding cell surfaces in thermally grown oxide to reduce their detrimental electronic activity and from isotropic etching to form a hexagonally-symmetric "honeycomb" surface texture. This texture, largely of inverted hemispheres, reduces reflection loss and improves absorption of infrared light by effectively acting as a randomizer. Results of a ray tracing model are presented, with the notable finding that up to 90% of infrared light is trapped in the substrate after the first two passes, compared with only 65% for the well known inverted pyramid structure. These optical features are considered to contribute to an exceptionally high short-circuit current density of 38.1 mA/cm/sup 2/. A further improvement is expected by using under-etched wells for these honeycomb cells.