Photoluminescence of porous silicon buried underneath epitaxial GaP

Abstract

Recent observations of visible, room-temperature photoluminescence in porous Si have stimulated research aimed at the realization of efficient, Si-based electroluminescent devices. To achieve electroluminescence, it may be beneficial to generate carriers with sufficient energy to populate the states of the quantum-confined Si structures. A viable method to accomplish this is to utilize a wide-band-gap heterojunction injector, such as GaP. Toward that end, we report the successful formation of porous Si buried underneath GaP islands, and we demonstrate that the buried porous Si layer exhibits strong photoluminescence (λ≊7000 Å).

Multi-Technique Study of Porous Silicon Membranes by Raman Scattering, Ftir, Xps, Aes and Sims

“…The light emission from Si is in the near infrared region and very inefficient (typically ~-10" 4 %). 4 This limits the applications of Si in optoelectronics where the direct gap III-V compounds, such as GaAs and InP, dominate. The discovery of the strong and visible RT photoluminescence and electroluminescence may result in the merger of optoelectronics and Si-based integrated processing techniques, and hence open a new field in optoelectronics.…”

Visible Electroluminescence from p-Type Porous Silicon in Electrolyte Solution

“…4,5 Most of the studies reported so far have concentrated on photoluminescence (PL) properties of PS. [6][7][8][9][10][11] Electroluminescence (EL) is, however, more important as far as technological application is concerned. In this respect, Koshida and Koyama demonstrated that a transparent metal/PS/p-Si/Al cell emits EL (orange) with relatively low applied voltage, although the quantum efficiency was quite low (10 -5 %).…”

Sintese e caracterização do silicio poroso e de novos revestimentos luminescentes

“…Este processo, aparentemente, forma fios quânticos autosustentados da ordem de 2 nanometros de espessura, tendo sua enorme luminescência explicada como resultante de efeitos de confinamento quântico [35]. Esta conclusão sobre a luminescência do silício poroso tem sido apoiada por diversos pesquisadores [36][37][38][39][40][41][42][43][44][45][46]. Modelos teóricos combinados com diversas técnicas espectroscópicas tem sido utilizados para buscar dar suporte a esta idéia [34,[47][48][49].…”