Publication | Closed Access
Impedance Spectra of p‐Type Porous Si‐Electrolyte Interfaces
30
Citations
0
References
1986
Year
Materials SciencePsl ElectrodesEngineeringElectronic MaterialsElectrode-electrolyte InterfaceFrequency DispersionNanoporous MaterialSurface ScienceApplied PhysicsIonic ConductorChemistryPsl ThicknessImpedance SpectraElectrochemical InterfaceElectrochemistryElectrical InsulationElectrochemical Surface Science
Frequency dispersion of the impedance of the p‐type porous Si layer (PSL)/aqueous electrolyte interface has been investigated to characterize its electrical properties. The PSL electrodes are formed on (100) p‐Si substrates (3.5–4.5 Ωcm in resistivity) by anodic treatment in solution. Impedance measurements over a wide frequency ranging from 2 Hz to 100 kHz are carried out as a function of PSL thickness. At low frequencies and low bias voltages, the impedance shows the characteristic behavior expected from the microporous structure. The flatband potential at the rear surface of PSL, determined from Mott‐Schottky plots, shifts to the negative side with increasing PSL thickness. This is presumably related to the ionic adsorption in PSL.