共发射极
饱和电流
材料科学
金属
太阳能电池
制作
重组
硼
硅
光电子学
蚀刻(微加工)
渗透(战争)
电流密度
分析化学(期刊)
纳米技术
电压
化学
图层(电子)
电气工程
冶金
物理
替代医学
病理
有机化学
运筹学
工程类
基因
医学
量子力学
生物化学
色谱法
作者
A. Edler,Valentin D. Mihailetchi,Lejo J. Koduvelikulathu,Corrado Comparotto,Radovan Kopecek,R. Harney
摘要
Abstract In this study, we investigate the metallization‒induced recombination losses of high efficiency bifacial n ‒type and p ‒type crystalline Si solar cells. From the experimental data, we found that the most efficiency limiting parameter by the screen‒printed metallization is the open‒circuit voltage ( V O C ) of the cells. We investigated the mechanism responsible for this loss by varying the metallization fraction on either side of the cell and determined the local enhancement in the dark saturation current density beneath the metal contacts ( J 0( m e t ) ). Under optimum fabrication conditions, the J 0( m e t ) at metal‒ p + (boron) emitter interfaces was found to be significantly higher compared with the values obtained for metal‒ n + emitters. A two‒dimensional simulation model was used to get further insight into the recombination mechanism leading to these V O C losses. The model assumes that metal contacts penetrate (or etch) into the diffused region following the firing process and depassivate the interface. Applying this model to our n ‒type solar cells with a boron p + emitter, we demonstrated that the simple loss of passivated area beneath the metal contact cannot explain the degradation observed in the V O C of the cell without considering a significant etching or metal penetration into the emitter region. Copyright © 2014 John Wiley & Sons, Ltd.
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