Indirect optical transition due to surface band bending in ZnO nanotubes
2010 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 108, no 10Article in journal (Refereed) Published
ZnO nanotubes (ZNTs) have been successfully evolved from ZnO nanorods (ZNRs) by a simple chemical etching process. Two peaks located at 382 nm and 384 nm in the UV emission region has been observed in the room temperature photoluminescence (PL) spectrum of ZNTs since the surface band bending in ZNTs induces the coexistence of indirect and direct transitions in their emission process. In addition, a strong enhancement of total luminescence intensity at room temperature in ZNTs has also be observed in comparison with that of ZNRs. Both temperature-dependent PL and time-resolved PL results not only further testify the coexistence of indirect and direct transitions due to the surface band bending, but also reveal that less nonradiative contribution to the emission process in ZNTs finally causes their stronger luminescence intensity.
Place, publisher, year, edition, pages
American Institute , 2010. Vol. 108, no 10
Zinc Oxide, Nanotube, Surface band bending, Indirect transition, Temperature-dependent photoluminescence
National CategoryNatural Sciences
IdentifiersURN: urn:nbn:se:liu:diva-60853DOI: 10.1063/1.3511345ISI: 000285005000053OAI: oai:DiVA.org:liu-60853DiVA: diva2:359556
Li Li Yang, Qingxiang Zhao, Muhammad Qadir Israr, Jamil Rana Sadaf, Magnus Willander, Galia Pozina and J. H. Yang, Indirect optical transition due to surface band bending in ZnO nanotubes, 2010, Journal of Applied Physics, (108), 10, 103513.
Copyright: American Institute of Physics