Digitala Vetenskapliga Arkivet

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
Investigation of the electronicstructures of single molecularjunctions from current voltage characteristics
KTH, Skolan för informations- och kommunikationsteknik (ICT).
2013 (Engelska)Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
Abstract [en]

Molecular electronics has lately shown significant progress due to rapid advances in investigative methods and is vital to the future of the electronic industry since the fundamental limits of the solid state transistors are closer than ever. To reach the application of using single molecules as electronic components, it is imperative to investigate the electronic structure of a single molecule connected to metal electrodes.

This research has focused on examining current voltage behavior to clarify the electronic structure using transition voltage spectroscopy (TVS) and a single level tunneling (SLT) model. In an approximate model, TVS can be used to determine the molecule frontier orbital-electrode energy gap (EF -ξ0) and in most cases prove molecular presence in the junction. The SLT model can be tted to experimental data to obtain molecule-electrode bond strength and molecule-electrode energy gap.

The measurement system prepared and tested was a mechanically controlled break junction. It has ability not only to test current voltage characteristics but also probe external magnetic and electric eld modulation eects. The current-voltage characteristics of benzenedithiol, hexanedithiol and a recently synthesized oligothiophene molecule with five thiophene rings were measured and analysed by using TVS and tting the SLT model. Most of the current-voltage characteristics could be tted using the SLT model. Analysis revealed that the variation in molecular conductance is mainly due to variation in molecule-electrode coupling strength and not due to the EF -ξ0 energy gap. Dierent EF -ξ0 were discovered for the three dierent molecules. It was shown that the transition voltage roughly approximates the EF -ξ0 energy gap by comparing the TVS results to the results obtained from fitting the SLT model.

Ort, förlag, år, upplaga, sidor
2013. , s. 89
Serie
Trita-ICT-EX ; 2013:227
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:kth:diva-129288OAI: oai:DiVA.org:kth-129288DiVA, id: diva2:651335
Utbildningsprogram
Civilingenjörsexamen - Mikroelektronik
Examinatorer
Tillgänglig från: 2013-09-25 Skapad: 2013-09-25 Senast uppdaterad: 2022-06-23Bibliografiskt granskad

Open Access i DiVA

fulltext(13606 kB)1570 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 13606 kBChecksumma SHA-512
7b4e56de5928718b0abbbcd66ec88574792e49796335c1acea40dd614a7a78f019b577ca084c230a3e70b67ba9203001c2f7f5f4119ffd3c5ad99adbce028441
Typ fulltextMimetyp application/pdf

Av organisationen
Skolan för informations- och kommunikationsteknik (ICT)
Teknik och teknologier

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 1571 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: 344 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