Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-04-11
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
10.1143/JJAP.44.7367
An epitaxial heterojunction made of a p-type perovskite manganite La0.8Sr0.2MnO3 film and an n-type strontium titanate SrTiO3:Nb substrate has been fabricated by the pulsed laser deposition technique. The I - V characteristics and photovoltaic properties are measured under a UV light irradiation in a wide temperature range down to 10 K. It is found that the junction works as an efficient UV photodiode with a large external quantum efficiency of 28%. It is also demonstrated that the manganite film can be doped with a certain amount of holes by the photcarrier injection. The maximum surface hole density is estimated to b 3.0 X 10^13 cm^-2.
Hiroi Zenji
Muramatsu Takaki
Muraoka Yuji
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