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Persistent Photoinduced Changes in Charge States of Donors and Acceptors in Hydrothermally Grown ZnO

Published online by Cambridge University Press:  01 February 2011

Nancy C. Giles ,
Yongquan Jiang ,
Xiaocheng Yang ,
S. M. Evans  and
L. E. Halliburton
Nancy C. Giles
Affiliation:
[email protected], West Virginia University, Physics, Hodges Hall, Morgantown, WV, 26506, United States
Yongquan Jiang
Affiliation:
[email protected], West Virginia University, Physics Department, Morgantown, WV, 26506, United States
Xiaocheng Yang
Affiliation:
[email protected], West Virginia University, Physics Department, Morgantown, WV, 26506, United States
S. M. Evans
Affiliation:
[email protected], West Virginia University, Physics Department, Morgantown, WV, 26506, United States
L. E. Halliburton
Affiliation:
[email protected], West Virginia University, Physics Department, Morgantown, WV, 26506, United States
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Abstract

Bulk ZnO grown by the hydrothermal technique was investigated using electron paramagnetic resonance (EPR), photoluminescence (PL), and infrared absorption (FTIR) techniques. Isolated subsitutional lithium is the dominant acceptor and could be detected using EPR or PL. A large concentration of neutral Li+-OH− centers were observed using FTIR data. EPR spectra assigned to Mn, Co, Ni, Fe, and Group III (Al, Ga) donors were also observed. Photoinduced changes in the charge states of the different deep and shallow centers were produced using 325 nm light, and the stability of these changes were monitored with EPR during pulsed thermal anneals. The charge-state changes for some defects were persistent and remained up to 300 K. These impurities, when present in device structures, may act as stable charge trapping sites.

Keywords

electron spin resonancedefectsII-VI
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 957: Symposium K – Zinc Oxide and Related Materials , 2006 , 0957-K03-04
Copyright
Copyright © Materials Research Society 2007

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References

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