Visible light emission from heavily doped porous silicon homojunction <i>pn</i> diodes

Abstract

We observed visible light emission with a peak wavelength of 640 nm from forward biased, heavily doped porous silicon homojunction pn diodes. The light emission is attributed to electron-hole recombination across the direct band gap of the monocrystalline quantum wires which make up the porous silicon junction layers.