Journal
PHYSICAL REVIEW B
Volume 67, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.67.045302
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We report first band-offset measurements obtained by multiphoton internal-photoemission induced second-harmonic generation. Our two-color contactless laser technique involves (1) optically pumping electrons into the oxide and (2) probing the resulting interface electric field using time-dependent second-harmonic generation. One- and two-photon internal-photoemission thresholds for the Si/SiO2 interface were measured to be 4.5 and 2.25 eV, respectively. This method promises to become a valuable experimental tool in determining band offsets in wide variety of semiconductor interfaces.
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