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

Isodiana Crupi; null Strano; null Barbagiovanni; Isodiana Crupi; null Franzò; null Mirabella

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

Isodiana Crupi, Strano, Barbagiovanni, Isodiana Crupi, Franzò, Mirabella

Ingegneria

Risultato della ricerca: Article › peer review

33 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 originale	English
Numero di pagine	5
Rivista	Applied Physics Letters
Volume	106
Stato di pubblicazione	Published - 2015

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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title = "Photoluminescence transient study of surface defects in ZnO nanorods grown by chemical bath deposition",

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. {\textcopyright} 2015 AIP Publishing LLC.",

author = "Isodiana Crupi and Strano and Barbagiovanni and Isodiana Crupi and Franz{\`o} and Mirabella",

year = "2015",

language = "English",

volume = "106",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

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TY - JOUR

T1 - Photoluminescence transient study of surface defects in ZnO nanorods grown by chemical bath deposition

AU - Crupi, Isodiana

AU - Strano, null

AU - Barbagiovanni, null

AU - Crupi, Isodiana

AU - Franzò, null

AU - Mirabella, null

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

UR - http://hdl.handle.net/10447/155602

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M3 - Article

VL - 106

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

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