Use of Etching to Improve Efficiency of the Multicrystalline Silicon Solar Cell by Using an Acidic Solution

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• 作者：Ayman Ahmed El-Amin
• 关键词：Multi ; crystalline Silicon ; Acid texturization ; Internal quantum efficiency ; Solar cells
• 刊名：SILICON
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：9
• 期：1
• 页码：39-45
• 全文大小：1,017 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Inorganic Chemistry
  Materials Science
  Organic Chemistry
  Polymer Sciences
  Biomedical Engineering
  Nanotechnology
  
• 出版者：Springer Netherlands
• ISSN：1876-9918
• 卷排序：9

文摘

Surface texturing methods using an alkaline solution for monocrystalline Si (c-Si) solar cells have been widely accepted to improve cell performance. However, multicrystalline Si (mc-Si) cells are difficult to be texturized by alkaline etching, because the grains in the substrates are randomly oriented. In this study, we considered a HF/HNO ₃/H ₂O acid solution for texturing the mc-Si cells. The conversion efficiency of mc-Si solar cells textured with the solution (HF/HNO ₃/H ₂O = 30:1:2.5) has relatively high values. In our study, sufficient light confinement is achieved, which contributes to the improvement of both the short circuit current and the conversion efficiency of the acid textured cells. The optimal acid etching ratio HF:HNO ₃:H ₂O = 30:1:2.5 with etching time of 60 s and lowering 41.9 % of the R value can improve 111.8 % of the conversion efficiency (η) of the developed solar cell. More detailed information is used to measure the internal quantum efficiency (IQE) and the lifetime of minority carriers. Thus, the acid texturing approach is instrumental to achieve high efficiency in mass production using relatively low-cost mc-Si as the starting material with proper optimization of the fabrication steps.