Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Electrical and Optical Characterization of InP Nanowire Ensemble Photodetectors
Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
2012 (Engelska)Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
Abstract [en]

Photodetectors are semiconductor devices that can convert optical signals into electrical signals. There is a wide range of photodetector applications such as fiber optics communication, infrared heat camera sensors, as well as in equipment used for medical and military purposes.

Nanowires are thin needle-shaped structures made of semiconductor materials, e.g. gallium arsenide (GaAs), indium phosphide (InP) or silicon (Si). Their small size, well-controlled crystal structure and composition as well as the possibility to fabricate them monolithically on silicon make them ideally suited for sensitive photodetectors with low noise.

In this project, Fourier Transform Infrared (FTIR) Spectroscopy is used to investigate the optical characteristics of InP nanowire-based PIN photodetectors. The corresponding electrical characteristics are also measured using very sensitive instrumentation. A total of 4 samples consisting of processed nanowires with 80 nm diameter but different density and length have been examined. The experiments were conducted from 78K (-196oC) to room temperature 300K (27oC). The spectrally resolved photocurrent and current-voltage (IV) curves (in darkness & under illumination) for different temperatures have been studied and analyzed.

The samples show excellent IV performance with very low leakage currents. The photocurrent scales with the number of nanowires, from which we conclude that most photocurrent is generated in the substrate. Spectrally resolved photocurrent data, recorded at different temperatures, display strong absorption in the near-infrared region with interesting peaks that reveal the underlying optical processes in the substrate and nanowires, respectively. The nature of the absorption peaks is discussed in detail.

This study is an important step towards integration of optically efficient III-V nanoscale devices on cheap silicon substrates for applications e.g. on-chip optical communication and solar cells for energy harvesting.

Ort, förlag, år, upplaga, sidor
2012. , s. 51
Nyckelord [en]
InP, Nanowire, Wurtzite, Zincblende, Photodetector, Semiconductor
Nationell ämneskategori
Nanoteknik
Identifikatorer
URN: urn:nbn:se:hh:diva-17457Lokalt ID: IDE1145OAI: oai:DiVA.org:hh-17457DiVA, id: diva2:513953
Presentation
2011-06-20, Room 201 E-building, Box 823, S-301 18, Halmstad, Sweden, 14:00 (Engelska)
Uppsök
fysik/kemi/matematik
Handledare
Examinatorer
Tillgänglig från: 2012-04-04 Skapad: 2012-04-04 Senast uppdaterad: 2012-04-04Bibliografiskt granskad

Open Access i DiVA

fulltext(2122 kB)1823 nedladdningar
Filinformation
Filnamn FULLTEXT02.pdfFilstorlek 2122 kBChecksumma SHA-512
256afd668bde905c9ac67d20ee181ea73a424aac268e3a0fca2ddd856e91d994d43c50b20128f442b73e99d97842cebeda67b6f9c5615e92d80e1a287bfa881d
Typ fulltextMimetyp application/pdf

Sök vidare i DiVA

Av författaren/redaktören
Ngo, Tuan Nghia
Av organisationen
Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE)
Nanoteknik

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 1823 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

urn-nbn

Altmetricpoäng

urn-nbn
Totalt: 1272 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf