Unlimited potential SE battery

The so-called selective emitter (SE-selectiveemiter) crystalline silicon solar cell is heavily doped at the contact portion of the metal gate line (electrode) and the silicon wafer, and lightly doped at the position between the electrodes. Such a structure can reduce the diffusion layer recombination, thereby improving the short-wave response of the light, and reducing the contact resistance between the front metal electrode and the silicon , so that the short-circuit current, the open circuit voltage, and the fill factor are better improved, thereby improving the conversion efficiency.

The Pluto Pluto battery developed by Wuxi Suntech has the latest conversion efficiency of 20.3%.

The battery of the SE structure has many advantages, such as lowering the series resistance and increasing the fill factor. In the screen printing process, the front gate contact resistance, the bulk resistance and the diffusion layer sheet resistance contribute the most to the series resistance. It can also reduce the carrier Auger recombination and improve the surface passivation effect. It can effectively reduce the Auger of carriers when flowing in the lateral direction of the diffusion layer and improve the carrier collection efficiency. Furthermore, it improves the short-wave spectral response of the light and increases the short-circuit current and open-circuit voltage.

Although the SE solar cell has not yet entered the mass production stage, the high conversion efficiency of the selective emitter battery can not be underestimated to reduce the production cost. After the technology and technology matching is more perfect, it is expected to become a hot product in the photovoltaic market in the next few years.

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