Abstract
We have compared the photovoltaic charging of the (1 0 0) surface termination for Cu doped and undoped Li 2 B 4 O 7 . While the surface charging at the (1 0 0) surface of Li 2 B 4 O 7 is significantly greater than observed at (1 1 0) surface, the Cu doping plays a role in reducing the surface photovoltage effects. With Cu doping of Li 2 B 4 O 7 , the surface photovoltaic charging is much diminished at the (1 0 0) surface. The density of states observed with combined photoemission and inverse photoemission remains similar to that observed for the undoped material, except in the vicinity of the conduction band edge.
Original language | English |
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Pages (from-to) | 3399-3403 |
Number of pages | 5 |
Journal | Applied Surface Science |
Volume | 257 |
Issue number | 8 |
DOIs | |
State | Published - Feb 1 2011 |
Externally published | Yes |
Funding
This work was supported by the Defense Threat Reduction Agency (Grant No. HDTRA1-07-1-0008 and BRBAA08-I-2-0128 ), the NSF “QSPINS” MRSEC (DMR-0820521) at UNL. The authors would like to thank Shan Yang ( ) and L.E. Halliburton for technical support and insights into the EPR spectra. The views expressed in this article are those of the authors and do not reflect the official policy or position of the Air Force, Department of Defense or the U.S. Government.
Keywords
- Lithium borate
- Oxide dielectric layers
- Surface photovoltaic charging