A Kind of Effective Method to Improve the Conversion Efficiency of the Solar Cell

For the bottleneck problem of the conversion efficiency in silicon-based solar cell, the Metallization Wrap– through (MWT) technology is one of the effective methods based on the analysis of factors affecting the solar cell conversion efficiency. The MWT technology is based on laser perforation and that the bus grid lines in the front surface of the solar cell are moved to the back surface. The effective area on the front surface increases and the conversion efficiency is improved. One of the most important processes in MWT technology is laser perforation and a new perforation scheme using two-dimensional laser array is designed. The high power laser is divided into a number of beams then those beams are arranged in a two-dimensional array. The silicon wafer is placed in a predetermined position by suction cup and is moved by stepper motor. The light barriers are opened by triggering switch and the silicon wafer is exposed. After a series of light, machine, and electric processes a rapid one-time two-dimensional array laser perforation on silicon wafer is formed. This patent is expected to be used in solar cell production department soon.