目前市场上85%以上的晶体硅太阳电池采用丝网印刷技术制备前、背电极.为了了解前电极的Ag-Si接触形成机理以及电流传输机制,对前电极烧结工艺以及Ag-Si接触的形成机理进行了分析,提出了4种Ag-Si界面的接触形式.根据不同的界面接触形式,指出两步隧道效应和多步隧道效应电流传输机制是最主要的电流传输方式.
At present, more than 85% of the crystalline Si solar cells in the world market are produced using screen printing technique to form the silver front contacts and aluminium rear contacts. However, the formation mechanisms of Ag-Si contacts and the current transport mechanisms are still not well understood. The sintering process of front contacts and the formation mechanisms of Ag-Si contacts are investigated. Four types of interface structures of Ag-Si contacts are presented. According to different types of interface structures, the main current transport mechanisms are concluded to be two-step and multi-step tunneling process from emitter to the silver through glass layers.
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