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  JA Solar to combat cell LID issues with Ga-doped p-type crystalline silicon wafers

‘Solar Module Super League’ (SMSL) member, JA Solar has licensed a number of patents from Shin-Etsu Chemical on doping Ga in silicon crystals and using the Ga-doped p-type crystalline silicon wafers for making solar cells to mitigate the impact of Light Induced Degradation (LID).

JA Solar indicated that adopting Ga-doped wafer processes would both improve solar cell conversion efficiencies and LID mitigation for advanced solar cells in the future, providing more stable and better long-term energy generation.

Jin Baofang, JA Solar's Chairman of Board of Directors, commented that "using Ga-doped silicon wafers for solar cell application definitely results in better performance of solar cells and PV modules, as well as the improvement of their long-term reliability. Being the patent holder of several leading technologies including bifacial PERC technology in China and other countries, JA Solar has benefited from and always supports IP protection. We deeply appreciate Shin-Etsu Chemical granting JA Solar their IP rights of Ga-doped crystalline silicon technology, which is an important step for JA Solar in introducing advanced technology and supporting the industry's intellectual property protection. JA Solar will continue to develop and provide high-performance PV products and clean-energy solutions to our customers worldwide through technological innovation and continuous performance improvement."

Typically, monocrystalline solar cells are fabricated on boron doped p-Type wafers but oxygen content can create defects that result in bulk lifetime degradation when the cells are first exposed to light. A preferred solution, developed at the University of New South Wales (UNSW) has been adopted by some major PV manufacturers, including LONGi Group.

However, there are known cost disadvantages in using Ga in the crystal growth phase and the need for consistently high-purity polysilicon.

[Oct 14, 2019 / pv-tech.org]   
 
 
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