Electronic transport and photovoltaic properties in Bi2Sr2Co2Oyepitaxial heterostructures
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences Beijing 100190, PRC
2 College of Physics Science and Technology, Hebei University - Baoding 071002, PRC
Received: 19 June 2013
Accepted: 21 August 2013
Epitaxial heterostructures constructed from the thermoelectric cobalt Bi2Sr2Co2Oy thin films and SrTiO3 as well as SrTi0.993Nb0.007O3 substrates were fabricated by pulsed-laser deposition. The scanning transmission electron microscopy results confirm that the heterostructures are epitaxial, with sharp and coherent interfaces. The temperature-dependent electrical transport properties and the Hall effects were systematically investigated. The Bi2Sr2Co2Oy/SrTi0.993Nb0.007O3 p-n heterostructure exhibits good rectifying current-voltage characteristics over a wide temperature range. A strong photovoltaic effect was observed in the Bi2Sr2Co2Oy/SrTi0.993Nb0.007O3 heterostructure, with the temperature-dependent photovoltage being systematically investigated. The present work shows a great potential of this new heterostructures as photoelectric devices.
PACS: 73.40.Lq – Other semiconductor-to-semiconductor contacts, / 73.40.-c – Electronic transport in interface structures / 72.40.+w – Photoconduction and photovoltaic effects
© EPLA, 2013