进电方式对太阳能级硅体电阻影响的基础研究

Basic Study on Body Resistance of Solar Silicon with Different Conduction Mode

电火花加工太阳能级硅,硅的体电阻是影响加工效率的决定因素,而不同的进电方式会使硅有不同的体电阻。基于欧姆定律的均匀柱形导体电阻公式和电导公式,推导出硅点、线、面等不同进电方式下的体电阻计算公式,发现点接触形式下体电阻与点附近的材料性质、接触形式密切相关,增加线的长度可减小线接触体电阻,而减小材料尺寸是减小面接触体电阻的有效方法。最后用27 V恒压电源伏安法测量硅的通电电流,电阻的计算结果与点-点接触之间的体电阻计算值相符。

When machining solar silicon based on EDM, the machining efficiency is determined by silicon body resistance, which is not the same if the conduction mode is different. Using resistance for-mula and conductance formula of column conductor with uniformity resistivity on Ohm＇s law, several body resistance formulas are deducted with different conduction mode about dot, line, and area contact mode, some knowledge are got including that body resistance by dot conduction is closely related with contact mode and material nature near to the contact point, and increasing contact length of line by line conduction could decrease body resistance, and small size of material is good for reducing body resistance by area conduction mode. An experiment by dot-dot contact mode, at last, using a 27 V constant voltage source, for testing conduction current on voltammetry is done, in which the calculated results of body resistance matches with its formula.