Production and Characterisation of Carbon Nanotubes for use in Photodetectors

Jensen, Jens Sejlund ; Mikkelstrup, Thomas Gam

4. term

Nanotechnology, Master

2016

2016-06-14

101 pages

Dette projekt inkluderer nogle af de mest bruge metoder til at gro kulstof nanorør, med fokus på deres brug i fotodetektorer. Der arbejdes hovedsageligt med nanorør groet via chemical vapour deposition, men andre metoder bliver også beskrevet. Teorien bag nanorørenes geometri og elektroniske båndstruktur fremlægges sammen med den basale teori bag metal-halvleder-metal fotodetektorer. Fotostrømsmekanismerne for kulstof nanorør gennemgås. Teorien bag karakterisering af nanorør via Raman spektroskopi er også inkluderet. Kulstof nanorør blev groet via chemical vapour deposition og blev karakteriseret med skanning elektron mikroskopi, atomar kraft mikroskopi, absorbans spektroskopi og Raman spektroskopi. Selvom nanorør blev produceret gennem forsøgene i denne rapport, var ingen af dem af god nok kvalitet til at blive brugt til fotodetektorer. Disse blev derfor produceret via nanorør indkøbt fra mkNANO i stedet. De købte nanorør blev separeret og deponeret på forskellige prøver, og elektriske kontakter blev lavet med et direct-write UV-litografi system. De blev efterfølgende undersøgt med strøm-spændings kurver og fotostrøms målinger.

This project examines the most common methods of growing carbon nanotubes, with focus on their use in photodetectors. It mainly deals with the chemical vapour deposition method of nanotube growth, but other methods are described as well. The theory behind the geometry and band structure of carbon nanotubes is discussed, along with the basic theory behind metal-semiconductor-metal photodiodes. The photocurrent mechanisms for carbon nanotubes is investigated. Furthermore the theory behind characterization of carbon nanotubes using Raman spectroscopy is also included. Carbon nanotubes are grown through chemical vapour deposition and are then characterised using scanning electron microscopy, atomic force microscopy, absorbance spectroscopy and Raman spectroscopy. While nanotubes were produced during experiments, no samples were ever of high enough quality for use in photodetectors, so samples were produced with nanotubes bought from mkNANO instead. The bought nanotubes were exfoliated and deposited on various samples and electrical contacts were created with a direct-write UV-lithography system, followed by current-voltage characteristics and photocurrent measurements.

Kulstof Nanorør ; Chemical vapour deposition ; Photocurrent ; Photodetector ; Carbon nanotubes

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