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ZnO Microcrystals for Light Emitting Diode and Photovoltaic Applications with Integration on Flexible Substrates

Published online by Cambridge University Press:  31 January 2011

Jesse J Cole  and
Heiko Jacobs
Jesse J Cole
Affiliation:
[email protected], University of Minnesota, Electrical Engineering, Minneapolis, Minnesota, United States
Heiko Jacobs
Affiliation:
[email protected], University of Minnesota, Electrical Engineering, Minneapolis, Minnesota, United States
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Abstract

We report a new integration approach to produce arrays of ZnO microcrystals for optoelectronic and photovoltaic applications. Demonstrated applications are n-ZnO/p-GaN heterojunction LEDs and photovoltaic cells. The integration process uses an oxygen plasma treatment in combination with a photoresist pattern on Magnesium doped GaN substrates to define a narrow sub-100nm width nucleation region. ZnO is synthesized in the defined areas by a hydrothermal technique using zinc acetate and hexamethylenetetramine precursors. Nucleation is followed by lateral epitaxial overgrowth producing single crystal disks of ZnO. The process provides control over the dimension and location of the ZnO crystals. The quality of the patterned ZnO is high; the commonly observed defect related emission in the electroluminescence spectra is suppressed and a single near-band-edge UV peak is observed. Transfer printing of the ZnO microcrystals onto a flexible substrate is also demonstrated in the context of transparent flexible electronics.

Keywords

optoelectronicmicroelectronicssurface reaction
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1192: Symposium PP – Materials and Devices for Flexible and Stretchable Electronics , 2009 , 1192-PP13-05
Copyright
Copyright © Materials Research Society 2009

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