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Nano Research 2017, 10(8): 2657-2666 https://doi.org/10.1007/s12274-017-1468-8
Research Article | Issue | Published: 14 March 2017

Nanowire encapsulation with polymer for electrical isolation and enhanced optical properties

Show Author's Information Tuomas Haggren( ),  Ali Shah,  Anton Autere,  Joona-Pekko Kakko,  Veer Dhaka,  Maria Kim,  Teppo Huhtio,  Zhipei Sun,  Harri Lipsanen( )
Department of Micro- and Nanosciences, Micronova Aalto UniversityAalto P.O. Box 13500, FI-00076 Finland
Keywords:
annealing, light emitting diode (LED), GaAs, antireflection, parylene-C, metallo-organic vapor, phase epitaxy (MOVPE)
Cite this article:
Haggren T, Shah A, Autere A, et al. Nanowire encapsulation with polymer for electrical isolation and enhanced optical properties. Nano Research, 2017, 10(8): 2657-2666. https://doi.org/10.1007/s12274-017-1468-8
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Abstract Full text Electronic supplementary material About this article

Light management and electrical isolation are essential for the majority of optoelectronic nanowire (NW) devices. Here, we present a cost-effective technique, based on vapor-phase deposition of parylene-C and subsequent annealing, that provides conformal encapsulation, anti-reflective coating, improved optical properties, and electrical insulation for GaAs nanowires. The process presented allows facile encapsulation and insulation that is suitable for any nanowire structure. In particular, the parylene-C encapsulation functions as an efficient antireflection coating for the nanowires, with reflectivity down to < 1% in the visible spectrum. Furthermore, the parylene-C coating increases photoluminescence intensity, suggesting improved light guiding to the NWs. Finally, based on this process, a NW LED was fabricated, which showed good diode performance and a clear electroluminescence signal. We believe the process can expand the fabrication possibilities and improve the performance of optoelectronic nanowire devices.


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Electronic supplementary material
About this article

Nanowire encapsulation with polymer for electrical isolation and enhanced optical properties

Show Author's information Tuomas Haggren( ), Ali Shah, Anton Autere, Joona-Pekko Kakko, Veer Dhaka, Maria Kim, Teppo Huhtio, Zhipei Sun, Harri Lipsanen( )
Department of Micro- and Nanosciences, Micronova Aalto UniversityAalto P.O. Box 13500, FI-00076 Finland

Abstract

Light management and electrical isolation are essential for the majority of optoelectronic nanowire (NW) devices. Here, we present a cost-effective technique, based on vapor-phase deposition of parylene-C and subsequent annealing, that provides conformal encapsulation, anti-reflective coating, improved optical properties, and electrical insulation for GaAs nanowires. The process presented allows facile encapsulation and insulation that is suitable for any nanowire structure. In particular, the parylene-C encapsulation functions as an efficient antireflection coating for the nanowires, with reflectivity down to < 1% in the visible spectrum. Furthermore, the parylene-C coating increases photoluminescence intensity, suggesting improved light guiding to the NWs. Finally, based on this process, a NW LED was fabricated, which showed good diode performance and a clear electroluminescence signal. We believe the process can expand the fabrication possibilities and improve the performance of optoelectronic nanowire devices.

Keywords: annealing, light emitting diode (LED), GaAs, antireflection, parylene-C, metallo-organic vapor, phase epitaxy (MOVPE)

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Publication history
Copyright
Acknowledgements

Publication history

Received: 11 October 2016
Revised: 07 December 2016
Accepted: 01 January 2017
Published: 14 March 2017
Issue date: August 2017

Copyright

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2017

Acknowledgements

Acknowledgements

The work was supported by the Nwires project (Academy of Finland project #284529) and by the Moppi project of Aalto Energy Efficiency Program. T. H. wishes to thank Emil Aaltonen Foundation, Tekniikan Edistämissäätiö, Ulla Tuominen Foundation and Walter Ahlström Foundation for supporting the research. Majority of the work was performed in the Micronova clean room facilities.

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