Multicrystalline silicon solar cells with low rear surface recombination

被引:2
|
作者
Stocks, M [1 ]
Blakers, A [1 ]
Cuevas, A [1 ]
机构
[1] Australian Natl Univ, Ctr Sustainable Energy Syst, Dept Engn, Canberra, ACT 0200, Australia
关键词
D O I
10.1109/PVSC.1997.653926
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Improvements in the manufacture of multicrystalline silicon (me-Si) and processing induced impurity gettering have enabled the demonstration of diffusion lengths in mo-Si much greater than the substrate thickness. High recombination velocities at the rear surface, rather than bulk recombination, can then limit cell efficiency. The traditional n(+)/p/p(+) cell structure (produced with aluminium alloying) is therefore less suitable for high lifetime material due to high effective rear surface recombination velocities. Rear surface recombination can be reduced by reducing the rear metal contact area and passivating most of the rear with thermal oxides. Record open circuit voltages (654mV) and high efficiencies (18.2%) are demonstrated with 4cm(2) cells on 0.5 Omega cm Eurosil substrates. Cells with local boron diffusions under the rear contacts also demonstrate high efficiencies.
引用
收藏
页码:67 / 70
页数:4
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