Analysis of Fine-Line Screen and Stencil-Printed Metal Contacts for Silicon Wafer Solar Cells
Analysis of Fine-Line Screen and Stencil-Printed Metal Contacts for Silicon Wafer Solar Cells
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硅片太阳能电池的细线丝网和模板印刷金属触点分析
DOI：
10.1109/jphotov.2014.2388073
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发表时间：
2015
影响因子：
3
通讯作者：
T. Mueller
中科院分区：
文献类型：
--
作者：
Vinodh Shanmugam;J. Wong;I. M. Peters;J. Cunnusamy;M. Zahn;Andrew Zhou;Rado Yang;Xiao Chen;A. Aberle;T. Mueller
用于太阳能电池的细线银印刷的主要挑战是实现高纵横比和具有低水平条纹的均匀线条。本文比较了两种高通量印刷技术，即丝网印刷与丝网印刷。基于印刷金属线轮廓、线段电导、整体电致发光（EL）图案和太阳能电池光电流-电压（I-V）特性的分布，引入了一种统计方法来评估印刷前栅极的质量。模型分布，结合有限元建模来预测现实的电池级电压变化，充分描述了所有四种特性。当线宽小于50 μm时，它很好地预测了丝网印刷和模板印刷太阳能电池的发散性能。在实验上，在156 mm × 156 mm p型单晶硅太阳能电池上实现了18.8%的最高批次平均效率，该电池使用具有30 μm线开口的支架，每个电池仅使用78 mg的银浆。
Primary challenges to fine-line silver printing for solar cells are achieving high aspect ratios and uniform lines with a low level of striations. This paper compares two high-throughput printing technologies, namely, printing by screens versus stencils. A statistical method is introduced to evaluate the quality of the printed front grid based on the distributions of printed metal line profiles, line segment conductance, overall electroluminescence (EL) pattern, and solar cell light current-voltage (I-V) characteristics. The model distribution, combined with finite-element modeling to predict realistic cell-level voltage variations, adequately describes all four kinds of characteristics. It predicts well the diverging performance of screen- and stencil-printed solar cells as the line width becomes less than 50 μm. Experimentally, the highest batch average efficiency of 18.8% was achieved on 156 mm × 156 mm p-type monocrystalline silicon solar cells printed with stencils having 30-μm line openings, using only 78 mg of silver paste per cell.