Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Cathodoluminescence study of ZnO wafers cut from hydrothermal crystals
Year:2008
Research Areas
  • Electronics engineering
Information
Abstract
ZnO is a wide bandgap semiconductor with very promising expectation for UV optoelectronics. The existence of large crystals should allow homoepitaxial growth of ZnO films for advanced optoelectronic devices. However, the ZnO substrates are not yet mature. Both defect induced by growth and by polishing together with the high reactivity of the surface are problems to their industrial application. Cathodoluminescence (CL) was used to probe the quality of substrates from two different suppliers. The surface damage was studied by varying the penetration depth of the electron beam, allowing to observe significant differences between the two samples within a 0.5-mm-thick surface layer. CL spectra show a complex band (P1) at 3.3 eV composed of two overlapped bands (3.31 and 3.29 eV) related to point defects (PD) and the 1-LO phonon replica of the free exciton (FX-1LO). This band (P1) is shown to be very sensitive to the presence of defects and the surface and thermal treatments. Its intensity compared with the excitonic band intensity is demonstrated to provide criteria about the quality of the substrates.
International
Si
JCR
Si
Title
JOURNAL OF CRYSTAL GROWTH
ISBN
0022-0248
Impact factor JCR
1,95
Impact info
Volume
310
Journal number
5
From page
1000
To page
1005
Month
ENERO
Ranking
Participants
  • Participante: Buguo Wang
  • Participante: M Callahan
  • Participante: M Avella
  • Autor: Andres Rodriguez Dominguez (UPM)
  • Participante: D Bliss
  • Participante: J Jiménez
  • Autor: Tomas Rodriguez Rodriguez (UPM)
  • Participante: J Mass
Research Group, Departaments and Institutes related
  • Creador: Departamento: Tecnología Electrónica
S2i 2021 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)