Shanghai Jiaotong University industrialized high-efficiency crystalline silicon solar cell research and development made new progress

The latest issue of the international academic journal of photovoltaic science and technology, "Progress in Photovoltaic Research and Application" Prog. Photovoltaics: Res. & Appl. 25, 280-290 (2017), IF: 7.365 with cover paper (also the first in the magazine) The cover paper) reported the research results of the Shen Wenzhong research group of the Solar Energy Research Institute of the School of Physics and Astronomy of Shanghai Jiaotong University in industrialized high-efficiency crystalline silicon double-sided solar cells.
N-type double-sided crystalline silicon solar cells are widely favored by academia and industry due to their double-sided power generation characteristics. They proposed a simple double-sided doping (front BBr3 thermal diffusion, backside P ion implantation) and a thin layer of Al2O3 (~4nm)/SiNx:H (~75nm) composite film passivation p+ emitter. After optimizing the peak sintering temperature and fine screen printing, the conversion efficiency of 20.89% of the front side and 18.45% of the back side was achieved on a large area (238.95 cm2) battery. Through software simulation, the n-type double-sided crystalline silicon solar cell of the structure can achieve a conversion efficiency of 21.32% under the condition of positive and reasonable square resistance. In addition to double-sided solar cell technology, Shen Wenzhong's research results in another industrialized high-efficiency crystalline silicon back-contact (BJBC) solar cell have also been published online in "Photovoltaics Research and Application Progress" [Prog. Photovoltaics: Res. & Appl. 2017, DOI: 10.1002/pip.2881].
Excellent optical surface (average reflectance <2.5%) and higher impededVoc (0.695V) on the battery precursor by wet chemistry, co-diffusion, ion implantation and annealing oxidation, laser patterning and PECVD; After screen printing and co-sintering, a small area (4.04 cm2) BJBC solar cell 22.20% conversion efficiency was obtained; using the same process, a conversion efficiency of 21.43% was obtained for a larger size (6-6 cm2). The research shows and demonstrates that the preparation of the BJBC crystalline silicon solar cell is completely compatible with the traditional industrial equipment, and has application prospects. These two achievements were all completed in cooperation with the listed company Shanghai Aerospace Automobile Electromechanical Co., Ltd. The related technologies have made good progress in the pilot production line of high-efficiency crystalline silicon solar cells, and have the prospect of industrial application.

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