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Solution-deposited ZnO-organic diodes with high current density and high frequency rectification under ambient conditions

Published online by Cambridge University Press:  01 February 2011

Bhola N Pal ,
Jia Sun ,
Byung Jun Jung  and
Howard E Katz
Bhola N Pal
Affiliation:
bpal3@jhu.edu, Johns Hopkins University, Department of Material Science and Engineering, 103 Maryland Hall,3400 N Charles street, Baltimore, MD, 21218, United States, 410-516-0567
Jia Sun
Affiliation:
jsun11@jhu.edu, Johns Hopkins University, Department of Material Science and Engineering, 103 Maryland Hall,, 3400 N Charles Street, Baltimore, MD, 21218, United States
Byung Jun Jung
Affiliation:
bjung6@jhu.edu, Johns Hopkins University, Department of Material Science and Engineering, 103 Maryland Hall,, 3400 N Charles Street, Baltimore, MD, 21218, United States
Howard E Katz
Affiliation:
hkatz5@jhu.edu, Johns Hopkins University, Department of Material Science and Engineering, 103 Maryland Hall,, 3400 N Charles Street, Baltimore, MD, 21218, United States
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Abstract

n-ZnO/p-Pentacene and n-ZnO/poly(bis(dodecyl)quaterthiophene) (p-PQT-12) vertical p-n junction diodes were prepared on ITO-coated glass. A continuous film of ZnO nanoparticles was grown on the ITO glass by dip-coating and subsequent heat treatment of a zinc acetate film. Pentacene was then thermally evaporated to form the ZnO/Pentacene diode, whereas PQT-12 was spin coated for the ZnO/PQT-12 diode. Based on the band energies of ZnO, pentacene and PQT-12, for efficient carrier injection, gold was chosen as the top electrode to complement the ITO for both diodes. The microstructures of ZnO and pentacene films are studied by AFM and show a layer of pentacene grains with about twice the extent of the underlying layer of ZnO grains, implying substantial interfacial contact between them The current density-voltage (J-V) measurement shows that the maximum current density for ZnO/Pentacene and ZnO/PQT12 are 160 A/cm2 and 350 A/cm2 respectively. The rectification was characterized by observation of full input-half output waves. Data indicate that these devices can operate up to frequencies of 20 MHz and 9 MHz for ZnO/Pentacene and ZnO/PQT12, respectively, under ambient environment conditions. This rectification frequency is higher than other reported organic and polymer Schottky diodes under these conditions. Turn on voltages of these diodes are also much lower than for the reported organic and polymer diodes.

Keywords

deviceselectronic materialoxide
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1035: Symposium L – Zinc Oxide and Related Materials–2007 , 2007 , 1035-L05-28
Copyright
Copyright © Materials Research Society 2008

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