Study O Applicatio Of Thick Film Metallizatio Paste For Crystalline Silicon Solar Cell

Metallization is one of the most crucial technologies in the manufacturing process of general crystalline silicon solar cell, make a impact on the solar cell conversion efficiency. Currently, the typical commercially metallization method is screen printing and sintering thick film paste for front side and back side of solar cell. Studies on application of thick film paste for crystalline silicon solar cell is highly important improvement for solar cell conversion efficiency.The thesis includes the content as following:The principle of screen printing is investigated. The influences of equipment, printing parameters, screen, paste, wafer and environment are analyzed. Based on several experiments to the effects of the screen and ambient temperature on the quality of the printing electrodes are summarized.We investigate two theories about the sintering process of front contacts and the formation mechanisms of Ag Si contacts. Using temperature tester and associated software the solar cell firing process is optimized. An optimal firing process is obtained by adjusting the peak temperature and the convention efficiency of solar cell is also improved. Using wafers with different values of sheet resistance, the solar cells were made. The output of solar cell in each group are compared and analyzed. We conclude that high sheet resistance solar cell needs low firing temperature window.In addition, different spacing of fine lines screen were used to make solar cell. The conclusions are that shorten the spacing between fine lines will improve solar cell series resistance and fill factor .but while increasing the shadow of the fine line loss will reduce the short circuit current. Therefore the design of fine lines required balance the impact of these two factor to achieve the best performance.