Electrochemical Er doping of porous silicon and its room-temperature luminescence at ∼1.54 μm

Abstract

We present a new electro-chemical method for incorporating high concentration Er ions deep into porous silicon layers and its intense photoluminescence at ∼1.54 μm at room temperature. Porous silicon layers prepared by anodic etching of p-type silicon substrates in HF/H2O are immersed in ErCl3/ethanol solution. Then the negative bias relative to a counter platinum electrode is applied to the samples. Er3+ ions are drawn into fine pores of the porous silicon layers by the electric field. After thermal annealing at ∼1300 °C in an O2/Ar atmosphere, the samples show sharp and intense Er3+-related photoluminescence at ∼1.54 μm at room temperature upon excitation with an Ar ion laser.

Photoluminescence of monocrystalline and stain-etched porous silicon doped with high temperature annealed europium

“…The excitation spectrum corresponding to the stain etched and Eu-doped PSLs was normalized to the 7 F 0 5 L 6 transition (395 nm), and measured at em = 615 nm, where it presents the maximum photoluminescent intensity, and the excitation spectrum corresponding to the Eu-doped non-textured sample was normalized to the 7 To evaluate which sample can offer a higher contribution to the enhancement of a solar cell efficiency, the increase of the e-h pairs produced by the down-shifting process in a crystalline silicon solar cell has been approximated considering only the emission at the maximum photoluminescent intensities at 615 nm for stain etched Eu-doped PSLs and 611 nm for the Eu-doped non-textured layer.…”

“…The incorporation of the rare earth ions in silicon can be carried out by ion implantation [6], electrochemical migration [7] or spark processing [8] and even sol-gel processes [9]. However the high cost of these techniques or the required time of the processes is not adequate for the solar cells fabrication process.…”

The Fabrication, Fluorescence Dynamics, and Whispering Gallery Modes of Aluminosilicate Microtube Resonators

“…[11] Along with these techniques the fabrication of microwire arrays in situ using electrochemical [12][13][14] and electroless [15][16][17] deposition in a porous template has proven to be a superior option for preparing more complex, higher-aspect-ratio 3D microtube and microwire arrays. [18] The formation of luminescent structures by incorporating rare-earth ions into a porous matrix using various techniques like ion-implantation, [19] electrochemical migration, [20] or the spin-on technique [21] has been demonIn this paper a novel technique for the production of aluminosilicate microtubes, which are shown to act as optical cylindrical microresonators, is described. The free-standing microtubes are fabricated by using vacuum-assisted wetting and filtration of silica gel through a microchannel glass matrix.…”

Luminescence of Lanthanides from Xerogels Embedded in Mesoporous Matrices

“…• C in sol--gel derived In 2 O 3 film [11], that is much lower than needed for erbium-implanted porous silicon [17] and other solids [18] or electrochemically doped porous silicon [19,20]. Er photoluminescence (PL) from the structure silicagel/porous silicon is strongly dependent on annealing conditions (temperature and atmosphere) and could be varied within 5 orders of magnitude [12].…”