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Current issue   Ukr. J. Phys. 2014, Vol. 58, N 9, p.846-852


Onyshchenko V.F., Karachevtseva L.A.

V. Lashkaryov Institute of Semiconductor Physics, Nat. Acad. of Sci. of Ukraine
(41, Nauky Ave., Kyiv 03028, Ukraine; e-mail: lakar@isp.kiev.ua)

Conductivity and Photo-Induced Conductivity of Two-Dimensional Macroporous Silicon Structures

Section: Solid matter
Original Author's Text: Ukrainian

Abstract: The effective conductivity and the photoconductivity in two-dimensional macroporous silicon structures have been measured, and their dependences on the macropore concentration and diameter have been calculated. The effective conductivity of macroporous silicon structures is found to decrease as the concentration and the volume fraction of pores grow. A size effect was revealed, a significant reduction in the thickness of the space charge region at small macropore diameters (the surface charge) is observed. The effective relative photoconductivity is found to be governed by the charge recombination and accumulation on the pore surface. Theoretical dependences of the relative photoconductivity in the examined structures are found to correspond to a surface recombination rate of 90 cm/s.

Key words: macroporous silicon structures, effective conductivity, photoconductivity