Surface Second Harmonic Studies of Si(111)/Electrolyte and Si(111)/SiO2/ Electrolyte Interfaces

The optical second harmonic (SH) response from Si(111) electrode surfaces has been studied and has been found to be highly potential dependent. For both H-terminated Si(111) surfaces in NJ4F, and oxide covered surfaces biased in H2SO4, the phase and the amplitude display a potential dependence which...

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Hauptverfasser:	Fischer, P R, Daschbach, J L, Richmond, G L
Format:	Report
Sprache:	eng
Schlagworte:	AMMONIUM COMPOUNDS AMPLITUDE DEPENDENCE Electrical and Electronic Equipment ELECTROCHEMISTRY ELECTRODES ELECTROLYTES FLUORIDES HARMONICS Inorganic Chemistry INTERFACES OPTICAL PROPERTIES Optics OXIDES PHASE Physical Chemistry POTENTIAL ENERGY REGIONS RESPONSE SECOND HARMONIC GENERATION SEMICONDUCTORS SILICON SILICON DIOXIDE SPACE CHARGE SURFACES THICKNESS
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Zusammenfassung:	The optical second harmonic (SH) response from Si(111) electrode surfaces has been studied and has been found to be highly potential dependent. For both H-terminated Si(111) surfaces in NJ4F, and oxide covered surfaces biased in H2SO4, the phase and the amplitude display a potential dependence which we attribute to field effect within the semiconductor space-charge region and at the surface of the Si(111) electrode. The studies are the first to demonstrate that for Si(1110)/oxide samples the potential dependence in the SH phase can be correlated with oxide thickness as demonstrated by examining samples of 0-40 Angstrom thickness. Si(111)/Oxide electrodes, Electrochemistry