Photoluminescence transient study of surface defects in ZnO nanorods grown by chemical bath deposition

Isodiana Crupi, Franzò, Mirabella, Strano, Barbagiovanni

Risultato della ricerca: Article

20 Citazioni (Scopus)

Abstract

Two deep level defects (2.25 and 2.03 eV) associated with oxygen vacancies (Vo) were identified in ZnO nanorods (NRs) grown by low cost chemical bath deposition. A transient behaviour in the photoluminescence (PL) intensity of the two Vo states was found to be sensitive to the ambient environment and to NR post-growth treatment. The largest transient was found in samples dried on a hot plate with a PL intensity decay time, in air only, of 23 and 80 s for the 2.25 and 2.03 eV peaks, respectively. Resistance measurements under UV exposure exhibited a transient behaviour in full agreement with the PL transient, indicating a clear role of atmospheric O2 on the surface defect states. A model for surface defect transient behaviour due to band bending with respect to the Fermi level is proposed. The results have implications for a variety of sensing and photovoltaic applications of ZnO NRs. © 2015 AIP Publishing LLC.
Lingua originaleEnglish
pagine (da-a)-
Numero di pagine5
RivistaApplied Physics Letters
Volume106
Stato di pubblicazionePublished - 2015

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surface defects
nanorods
baths
photoluminescence
air
defects
decay
oxygen

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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Photoluminescence transient study of surface defects in ZnO nanorods grown by chemical bath deposition. / Crupi, Isodiana; Franzò; Mirabella; Strano; Barbagiovanni.

In: Applied Physics Letters, Vol. 106, 2015, pag. -.

Risultato della ricerca: Article

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AU - Crupi, Isodiana

AU - Franzò, null

AU - Mirabella, null

AU - Strano, null

AU - Barbagiovanni, null

PY - 2015

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