Journal
APPLIED PHYSICS LETTERS
Volume 102, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4790389
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Funding
- National Science Foundation [DMR-0706227]
- Robert Welch Foundation [F-1038]
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Optical second-harmonic generation (SHG) from Si surfaces covered with nanometer-thin SiO2 varies with the laser exposure time because of photo-injection and charge trapping. We use UV lamp excitation to decompose the effects of photo-injection and charge trapping on the time-dependence of SHG of 1.65 eV photons at the Si/SiO2 interface. We find that the time-dependence of SHG in air arises mainly from the cooperative effect of three-photon photo-injection and charge trapping by surface O-2. When the oxide is ultrathin (<= 1.5 nm), the time-dependence also includes a significant contribution from one and two-photon photo-assisted tunneling. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4790389]
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