Improvement mechanism of photoluminescence in iron-passivated porous silicon

Photoluminescence enhancement and stabilisation of porous silicon passivated by iron

“…They have found a strong PL intensity and the PL peak energy is centred at about 1.85 eV. In the same way, Chen et al [13] have reported that, after hydrothermal erosion, silicon dangling bonds on porous layer are passivated by Fe ions, which has induced an increase of the PL intensity with storage oxidation in air while that corresponding to the PS decreases. They have reported, also, that the PL band is blue shifted only for PS within oxidation time.…”

“…5a). Chen et al [13] have reported that iron-passivation plays a protect layer and prevents the PL blueshift. Then, the iron, passivated the majority of silicon dangling bonds, is oxidised during storing time.…”

Electrical performance in iron-passivated porous silicon film

“…This peak is broadened asymmetrically in PS:Fe and a large band appears at 505 cm −1 related to the structure modification of porous silicon after impregnation in aqueous ferric nitrate solution. Chen et al [19] have analysed iron-passivated PS using hydrothermal etching process. From Raman spectroscopy, they reported the existence of Si-Fe bonds on the surface and suggested the reaction pathways inducing the passivation of PS by Si-Fe 2+ (two valence passivation) and Si-Fe + (monovalence passivation).…”

Correlation between optical properties surface morphology of porous silicon electrodeposited by Fe 3+ ion

“…However, the inefficiency and instability [8,9,10] of the optical properties of the PS create many problems in the application area such as the decrease of PL intensity [9,10] and the shift of the energy of maximum of PL band [9,10] due to the surface oxidation of PS crystallites. To solve this problem, new nano-composites lines have been developed by the insertion of atomic or molecular species such as hydrocarbons, polymers, semiconductors and transition metals [11][12][13][14][15]. Herino et al [16] investigated the deposition of metals and other conducting materials in relation to their influence on the luminescent properties of PS and to their modification of its conductivity.…”