Reporter recently learned from the Chemical and Chemical Engineering College of Yangzhou University, led by Associate Professor Yang Zhanjun efficient back-passivated MWT polycrystalline battery key technology research made important progress. The technology has dual advantages of high efficiency and low cost, and its large-scale application and development will likely change the current pattern of the entire PV market.

It is understood that, from the current battery industry point of view, through technology research and development and improvement to improve the photoelectric conversion efficiency and expand the industrial scale to reduce the manufacturing cost of solar cells watts, is the development trend of crystalline silicon solar cell industry. MWT back contact cell technology is the use of laser drilling, the back of the wiring technology, eliminating the front electrode of the main gate line, positive electrode grid line current collected through the hole in the silver paste to the back, so that the battery positive and negative electrode points are Which is distributed on the back of the cell to effectively reduce the light obscuration of the front grating line, improve the conversion efficiency, and simultaneously reduce the silver paste consumption and the minority recombination loss at the metal electrode-emitter interface. Compared with the conventional H-type cell, the MWT cell has more flexibility in design, including the layout and number of laser openings, the layout of the front graticule and the graphic design, and the distribution of the back electrode points.

According to reports, in the past few years, MWT back contact technology has developed rapidly, the average efficiency of polycrystalline MWT cells reached 18.2% -18.5%, and MWT technology is also possible to integrate almost other possible new industrialization technologies, including PERC, N-type and black silicon technology, the effect of stacking up even better than the sum of a single technology gain. At present, many international and domestic PV manufacturers have given MWT back contact technology has given the focus and interest, causing widespread concern in the market. "The new MWT back contact cells and components we developed have eliminated the need for conventional grid gate lines and significantly reduced shading losses. The advanced interconnect approach greatly reduces package loss and debris, and its theoretical efficiency is much higher In the traditional crystalline silicon solar cells and components, the efficiency of industrial battery components to increase space. "Yang Zhanjun said.

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