Ml. Gong et al., A novel electrochemical approach for fabrication of photoluminescent erbium-doped porous silicon, APPL PHYS A, 68(1), 1999, pp. 107-110
We report a novel electrochemical doping (ECD) approach for porous silicon
(PS) with rare earths, constant-potential electrolysis, and a new electroly
te solution system. The doped erbium concentration was high: up to 10(21)/c
m(3). After this new ECD treatment, PS:Er was found to emit much more inten
se room-temperature visible photoluminescence than both the porous silicon
control and the PS:Er prepared by constant-current ECD. Room-temperature TR
photoluminescence around 1.54 mu m was observed for the first time without
any post-doping annealing.