The latest issue of the most advanced academic publication in the field of photovoltaic science and technology in the field "Progress in Photovoltaic Research and Applications" Prog. Photovoltaics: Res. & Appl. 25, 280-290 (2017), IF: 7.365 with cover paper (also the magazine's first The paper cover report) reported the research results of Shen Wenzhong's research team in the Institute of Solar Energy, Institute of Physics and Astronomy, Shanghai Jiaotong University on the industrialization of high-efficiency crystalline silicon double-sided solar cells.
N-type double-sided crystal silicon solar cells are widely favored by academia and industry because of their double-sided power generation characteristics. They proposed a simple method of double-side doping (front BBr3 thermal diffusion, backside P ion implantation) and thin layer Al2O3 (~4nm)/SiNx:H (~75nm) composite film passivation p+ emitter method. After optimized peak sintering temperature and fine screen printing, the conversion efficiency of front 20.89% and back 18.45% was achieved on a large area (238.95cm2) battery. Through software simulation, the n-type double-sided crystalline silicon solar cell can achieve a conversion efficiency of 21.32% under the positive and square resistance.
In addition to the double-sided solar cell technology, another research result of Shen Wenzhong's industrialized high-efficiency crystalline silicon back junction back-contact (BJBC) solar cell has also been published online in Progress in Photovoltaic Research and Applications [Prog. Photovoltaics: Res. & Appl. 2017, DOI: 10.1002/pip.2881].
Through wet chemical, co-diffusion, ion implantation and annealing oxidation, laser patterning, and PECVD processes, superior optical surfaces (average reflectance <2.5%) and high implied Voc (0.695V) were achieved on the cell precursor; After screen printing and co-sintering, a 22.40% conversion efficiency of a small area (4.04cm2) of BJBC solar cells was obtained; using the same process, a conversion efficiency of 21.43% of a larger size (6 Ì6cm2) was obtained. The research demonstrated and demonstrated that the preparation of the BJBC crystalline silicon solar cell is completely compatible with traditional industrial equipment and has application prospects.
Both of these achievements were completed in cooperation with the Shanghai Aerospace Automotive Electromechanical Co., Ltd., a listed company, and related technologies have made good progress in the company's high-efficiency silicon silicon solar cell pilot production line, with industrialized application prospects.
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