title: Current-voltage characteristics of manganite-titanite perovskite junctions.
abstract: After a general introduction into the Shockley theory of current voltage (J-V) characteristics of inorganic and organic semiconductor junctions of different bandwidth, we apply the Shockley theory-based, one diode model to a new type of perovskite junctions with polaronic charge carriers. In particular, we studied manganite-titanate p-n heterojunctions made of n-doped SrTi1- y Nb y O3, y = 0.002 and p-doped Pr1- x Ca x MnO3, x = 0.34 having a strongly correlated electron system. The diffusion length of the polaron carriers was analyzed by electron beam-induced current (EBIC) in a thin cross plane lamella of the junction. In the J-V characteristics, the polaronic nature of the charge carriers is exhibited mainly by the temperature dependence of the microscopic parameters, such as the hopping mobility of the series resistance and a colossal electro-resistance (CER) effect in the parallel resistance. We conclude that a modification of the Shockley equation incorporating voltage-dependent microscopic polaron parameters is required. Specifically, the voltage dependence of the reverse saturation current density is analyzed and interpreted as a voltage-dependent electron-polaron hole-polaron pair generation and separation at the interface.
authors.affiliation: Institute of Materials Physics, University of Goettingen, Friedrich-Hund-Platz 1, 37077 Goettingen, Germany.
authors.forename: Benedikt
authors.initials: B
authors.lastname: Ifland
authors.affiliation: 4th Physical Institute, University of Goettingen, Friedrich-Hund-Platz 1, 37077 Goettingen, Germany.
authors.forename: Patrick
authors.initials: P
authors.lastname: Peretzki
authors.affiliation: Institute of Materials Physics, University of Goettingen, Friedrich-Hund-Platz 1, 37077 Goettingen, Germany.
authors.forename: Birte
authors.initials: B
authors.lastname: Kressdorf
authors.affiliation: 4th Physical Institute, University of Goettingen, Friedrich-Hund-Platz 1, 37077 Goettingen, Germany.
authors.forename: Philipp
authors.initials: P
authors.lastname: Saring
authors.affiliation: Institute of Materials Physics, University of Goettingen, Friedrich-Hund-Platz 1, 37077 Goettingen, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Kelling
authors.affiliation: 4th Physical Institute, University of Goettingen, Friedrich-Hund-Platz 1, 37077 Goettingen, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Seibt
authors.affiliation: Institute of Materials Physics, University of Goettingen, Friedrich-Hund-Platz 1, 37077 Goettingen, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Jooss
keywords: current–voltage characteristics; perovskites; photovoltaics; polarons