Photocarrier transport in 2D macroporous silicon structures

• Autorzy: Karachevtseva L. , Onyshchenko V. , Sachenko A.
• Języki publikacji: EN

Abstrakty

EN

The mechanisms of photocarrier transport through a barrier in the surface space-charge region (SCR) of 2D macroporous silicon structures have been studied at photon energies comparable to that of the silicon indirect band-to-band transition. It was found that the photoconductivity relaxation time was determined by the light modulation of barrier on the macropore surface; as a result, the relaxation itself obeyed the logarithmic law. The temperature dependence of the photoconductivity relaxation time was determined by the thermionic emission mechanism of the current transport in the SCR at temperatures T > 180 K, and by the tunnel current flow at T < 100 K, with temperature-independent tunnelling probability. The photo-emf was found to become saturated or reverse its sign to negative at temperatures below 130 K because of light absorption due to optical transitions via surface electronic states close to the silicon conduction band. In this case, the surface band bending increases due to the growth of a negative charge of the semiconductor surface. The equilibrium electrons in the bulk and photoexcited holes on the macropore surface recombine through the channel of multistage tunnel recombination between the conduction and valence bands.

Słowa kluczowe

EN

macroporous silicon; photoconductivity; photo-emf; surface states

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2010
• Tom: Vol. 18, No. 4
• Strony: 394--399
• Opis fizyczny: Bibliogr. 21 poz., wykr.

Twórcy

autor

Karachevtseva L.

autor

Onyshchenko V.

autor

Sachenko A.

• Lashkaryov Institute of Semiconductor Physics of NAS of Ukraine, 41 Nauki Prosp., 03-028 Kyiv, Ukraine,

Bibliografia

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