Some peculiarities of electrophysical characteristics of Si-YBa2Cu3O7 contacts: a possible energy structure of metal oxide ceramics

V.S.Nevolin, V.A.Skryshevsky

T.Shevchenko Kyiv National University, Department of Radiophysics, 64 Volodimirska St., 01017 Kyiv, Ukraine

Received July 21, 1998

Electrophysical characteristics of p- and n-Si contacts with YBa2Cu3O7 ceramics have been studied. Basing on comparative consideration of those characteristics with other experimental data on CuO and YBa2Cu3O7, a possible model has been proposed for the YBa2Cu3O7 energy structure where the ceramics is presented as a multiband material with consecutive symmetric arrangement of central and side valleys. The model of nonequilibrium charge carriers cascade recombination has been proposed consisting in a hierarchic change of the recombination mechanisms under variation of the applied voltage and temperature from the three-molecular recombination to bimolecular and then single-molecular ones.

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