Article ID Journal Published Year Pages File Type
1529472 Materials Science and Engineering: B 2012 5 Pages PDF
Abstract

Schottky diodes have been fabricated on doped Si/SiO2 substrates in air, by simply crossing individual electrospun tin oxide (SnO2) and poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonate) (PEDOT-PSSA) nanoribbons. The conductivity of PEDOT-PSSA was ∼6 S/cm with no observable field effect, while SnO2 exhibited n-doped field effect behavior with a charge mobility of ∼3.1 cm2/V-s. The diodes operate in air or in vacuum, under ambient illumination or in the dark, with low turn-on voltages and device parameters that are tunable via a back gate bias or a UV light source. Their unique design involves a highly localized active region that is completely exposed to the surrounding environment, making them potentially attractive for use as sensors. The standard thermionic emission model of a Schottky junction was applied to analyze the forward bias diode characteristics and was successfully tested as a half wave rectifier.

Graphical abstractCrossed SnO2/PEDOT-PSSA nanoribbon Schottky diodes.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlight► An inexpensive electrospinning technique is used to fabricate crossed nanoribbons of n-doped tin oxide and p-PEDOT. ► Each intersection is a localized Schottky diode that is completely exposed to the environment after electrodes deposition. ► This makes it useful as a gas and light sensor. ► In addition, the ability to tune the diode parameters via a back gate truly makes this device multifunctional. ► A half wave rectifier has been demonstrated with this device under UV illumination.

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Physical Sciences and Engineering Materials Science Electronic, Optical and Magnetic Materials
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