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I-V and Optical Characterization of InP/InAsP Quantum Disc-in-Nanowire Infrared Photodetectors
Halmstad University, School of Information Technology.
2019 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Photodetectors are semiconductor devices capable of converting optical signals into electrical signals. There is a wide range of applications for photodetectors such as fiber optics communication, infrared heat camera sensors, as well as in medical and military equipment.Nanowires are thin needle-shaped structures consisting of semiconductor materials such as gallium arsenide (GaAs), indium phosphide (InP) or silicon (Si). They are ideally suited for sensitive photodetectors with low noise due to their small size, well-controlled crystal structure, and composition tunability, as well as the possibility to fabricate them monolithically on silicon.In this thesis, Fourier Transform Infrared (FTIR) Spectroscopy was used to investigate the optical characteristics of InP nanowire-based n+-i-n+ photodetectors with 20 embedded InAsP quantum discs in each InP nanowire. The spectrally resolved photocurrent was measured and analyzed at different angles of incidence. Also, detailed current-voltage characteristics in dark and under illumination were recorded and analyzed.Summarized, the samples showed very good I-V performance with low dark leakage currents. The photocurrent scales with the numbers of nanowires, from which we conclude that most of the photocurrent is generated in the nanowires. Spectrally resolved photocurrent data, recorded at room-temperature, shows strong absorption in the near-infrared region with interesting peaks that reveal, the underlying optical processes in the substrate and nanowires.

Place, publisher, year, edition, pages
2019. , p. 40
Keywords [en]
Nanowires, Infrared photodetectors, Quantum disc, Photocurrent
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hh:diva-40162OAI: oai:DiVA.org:hh-40162DiVA, id: diva2:1335189
Subject / course
Electronics
Educational program
Master's Programme in Electronics Design, 60 credits
Supervisors
Examiners
Available from: 2019-07-09 Created: 2019-07-04 Last updated: 2019-07-09Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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