The Application of CFZ-Si Monocrystal Material in Photovoltaic Field

Abstract:

As the main substrate materials for solar cell, Czochralskisilicon (CZ-Si) has more crystal defects, higher impurities content and so on, which limit the further improvement of conversion efficiency (h). Floating zone melting silicon (FZ-Si) has excellent performance but the feed rod cost is much higher, so it is hardly used for solar cell widely. To solve this problem, we developed CFZ silicon monocrystal (CFZ-Si). First the poly was made into poly rod withΦ110~Φ130mm by CZ process and then made into CFZ-Si by FZ method. During FZ process, the resistivity is controlled by gas doping and the process is adjustable. CFZ-Si combines advantages of CZ-Si with FZ-Si. It has less crystal defects, lower impurities content especially oxygen content (<0.2 ppm) and excellent consistency of axial resistivity. Meanwhile, poly rod used has lower price and easier fabrication, so CFZ-Si cost is much lower and the further cost reduction is easy. Therefore, CFZ-Si has significant comprehensive advantages and broader prospect in the future photovoltaic field.

• Periodical: Advanced Materials Research (Volumes 915-916)
• Pages: 519-523
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.915-916.519
• Online since: April 2014
• Authors: Yan Jun Wang, Xue Nan Zhang, Liu Qiao*, Zheng Liu, Jia Liu, Yun Feng Wang, Hao Ping Shen
• Keywords: CFZ-Si, Conversion Efficiency, Crystal Defects, Oxygen Content

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