On the correlation of crystal defects and band gap properties of ZnO nanobelts
Document Type
Article
Publication Date
9-3-2011
Department
Department of Mechanical Engineering-Engineering Mechanics; Department of Physics
Abstract
We report here investigations of crystal and electronic structure of as-synthesized and annealed ZnO nanobelts by an in-situ high-resolution transmission electron microscope equipped with a scanning tunneling microscopy probe. The in-situ band gap measurements of individual ZnO nanobelts were carried out in scanning tunneling spectroscopy mode using the differential conductance dI/dV–V data. The band gap value of the as-synthesized ZnO nanobelts was calculated to be ∼2.98 eV, while this property for the annealed nanobelts (∼3.21 eV) was close to the band gap value for bulk ZnO materials (∼3.37 eV). The difference in the band gap value of the as-synthesized ZnO nanobelts and annealed ones was attributed to the planar defects (e.g. stacking faults and twins). These defects can alter the electronic structure by producing localized resonant states that result in band gap reduction.
Publication Title
Applied Physics A
Recommended Citation
Asthana, A.,
Momeni, K.,
Prasad, A.,
Yap, Y. K.,
&
Yassar, R. S.
(2011).
On the correlation of crystal defects and band gap properties of ZnO nanobelts.
Applied Physics A,
105(4), 909-914.
http://doi.org/10.1007/s00339-011-6554-2
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/41
Publisher's Statement
© Springer-Verlag 2011. Publisher's version of record: https://doi.org/10.1007/s00339-011-6554-2