Discrete tunneling of holes in porous silicon |
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Authors: | E S Demidov V V Karzanov V G Shengurov |
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Institution: | (1) N. I. Lobachevskii Nizhni Novgorod State University, 603600 Nizhnii Novgorod, Russia |
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Abstract: | It is pointed out that in the partial oxidation of porous silicon (PS) formed on heavily doped crystals, the topology of the
pores can result in the formation of an anisotropic material with strings of nanometersized silicon granules embedded in insulating
silicon dioxide SiO2. In this range of granule sizes the correlation effects in the tunneling of electrons (holes) are strong on account of their
Coulomb interaction. This should be manifested as discrete electron and hole tunneling at temperatures comparable to room
temperature. The room-temperature current-voltage characteristics of n
+-PSp
+-p
+ diode structures with a PS interlayer on p
+-Si, which exhibit current steps on the forward and reverse branches, are presented. The current steps are attributed to discrete
hole tunneling along the silicon strings in SiO2.
Pis’ma Zh. éksp. Teor. Fiz. 67, No. 10, 794–797 (25 May 1998) |
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Keywords: | |
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