The porous silicon samples were prepared by anode electrochemical etching method.In this reserch

we discovered that porous silicon layer(PSL)can store charge for the first time.This characteristic of PSL shows:(1)There is a quantity of charge in PSL after anode electrochemical etching;(2)PSL possesses charge storage character similar to capacity after it was charged by DC(direct current)supply.The experiment results show n-Si sample can store charge up to 5×10

-3

coulomb after charged for twenty minutes with DC 12V supply.