Photoinduced schottky barrier in photorefractive materials
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2010-03
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We report on the first experimental evidence of a Schottky barrier effect produced by the action of light
in an otherwise purely Ohmic contact between a nominally undoped photorefractive titanosillenite
Bi12TiO20 crystal and a transparent conductive SnO2 electrode. The photorefractive crystal is sandwiched
between two transparent electrodes and a Schottky barrier is built up in the illuminated crystal-electrode
interface under the action of light with photonic energy large enough to excite charge carriers from the
Fermi level into the conduction band. The contact remains purely Ohmic under illumination with photonic
energy below that of the Fermi gap and the photoinduced barrier almost disappears if the photonic energy
is large enough to produce electron-hole pairs.
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FREJLICH, Jaime; LONGEAUD, Christophe; CARVALHO, Jesiel F. Photoinduced schottky barrier in photorefractive materials. Physical Review Letters, New York, v. 104, e116601, 2010.