Exciton recombination dynamics in single ZnO tetrapods

Journal Article · Wed Dec 04 00:00:00 EST 2013 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4848293· OSTI ID:22261963

Fernandes-Silva, Lígia C. ^[1]; Martín, Maria D.; Meulen, Herko P. van der; Calleja, José M.; Viña, Luis ^[2]; Klopotowski, Lukasz ^[3]

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1. Departamento de Física de Materiales, Universidad Autónoma de Madrid, E-28049 Madrid (Spain)
2. Departamento de Física de Materiales, Universidad Autónoma de Madrid, E-28049 Madrid, Spain and Instituto de Ciencia de Materiales Nicolás Cabrera, Universidad Autónoma de Madrid, E-28049 Madrid (Spain)
3. Polish Academy of Sciences, Institute of Physics, 02-668 Warsaw (Poland)

We present the optical properties of individual ZnO tetrapods as a function of excitation power and temperature by time-integrated and time-resolved spectroscopy. At 10K, we identify the different excitonic transitions by both their characteristic energy and their excitation power dependence. When we increase the tetrapod temperature we observe that the emission intensity decrease and occur a red shift of the emission energies. Our time-resolved studies confirm the predominance of the radiative recombination at low temperatures (< 45 K). Increasing the temperature opens up the non-radiative channels, which are evidenced by a much faster decay time.

• OSTI ID: 22261963
• Journal Information: AIP Conference Proceedings, Vol. 1566, Issue 1; Conference: ICPS 2012: 31. international conference on the physics of semiconductors, Zurich (Switzerland), 29 Jul - 3 Aug 2012; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
EMISSION
EXCITATION
OPTICAL PROPERTIES
SPECTROSCOPY
TIME RESOLUTION
ZINC OXIDES