ELECTROLUMINESCENCE AND CHEMILUMINESCENCE OF POROUS SILICON IN NONAQUEOUS SOLUTION

The rotating ring-disk configuration, consisting of a Pt disk and Si r ing, was used to investigate light emission from porous Si in acetonit rile. The electroluminescence (EL) of n-type porous Si and the chemilu minescence (CL) of n- and p-type porous Si in the presence of an oxidi zing agent in solution are reported. The EL and CL characteristics are similar to those observed in aqueous solution. No EL of p-type porous Si could be observed in the presence of a strong reducing agent, prob ably due to bandedge unpinning. The photon energy of the EL of n-type porous Si is in good agreement with that deduced from the relative pos itions of the redox energy level and the semiconductor bandedges.