Free electron behavior in InN: On the role of dislocations and surface electron accumulation
2009 (English)In: Applied Physics Letters, ISSN 0003-6951, Vol. 94, no 2, 022109- p.Article in journal (Refereed) Published
The free electron behavior in InN is studied on the basis of decoupled bulk and surface accumulation electron densities in InN films measured by contactless optical Hall effect. It is shown that the variation in the bulk electron density with film thickness does not follow the models of free electrons generated by dislocation-associated nitrogen vacancies. This finding, further supported by transmission electron microscopy results, indicates the existence of a different thickness-dependent doping mechanism. Furthermore, we observe a noticeable dependence of the surface electron density on the bulk density, which can be exploited for tuning the surface charge in future InN based devices.
Place, publisher, year, edition, pages
2009. Vol. 94, no 2, 022109- p.
dislocations, doping, electron density, Hall effect, III-V semiconductors, indium compounds, semiconductor thin films, transmission electron microscopy, vacancies (crystal), wide band gap semiconductors
National CategoryNatural Sciences
IdentifiersURN: urn:nbn:se:liu:diva-16630DOI: 10.1063/1.3065030OAI: oai:DiVA.org:liu-16630DiVA: diva2:159542
Vanya Darakchieva, T Hofmann, M Schubert, Bo Sernelius, Bo Monemar, Per Persson, Finn Giuliani, E Alves, H Lu and W J Schaff , Free electron behavior in InN: On the role of dislocations and surface electron accumulation, 2009, Applied Physics Letters, (94), 2, 022109.
Copyright: American Institute of Physics