Impedance Analysis of Surface Modified Ga0.5In0.5P-Aqueous Electrolyte Interface

Shyam S. Kocha, John A. Turner

Research output: Contribution to journalArticlepeer-review

17 Scopus Citations


In this work electrochemical impedance spectroscopy was carried out on pre- and post-etched Ga0.5In0.5P (1.8-1.9 eV) as well as quinolinol-modified surfaces, over seven decades of frequencies. The spectra were examined in the Bode as well as complex impedance planes and deconvoluted using non-linear-least-squares fitting to obtain equivalent circuits that isolated the space charge from the surface states. Chemical wet-etching of Ga0.5In0.5P was found to remove surface states as evidenced in the removal of the low frequency time constant from the spectra. Treatment with 8-quinolinol was found to shift the flat-band potential in the positive direction vs. she by about 300 mV in near neutral electrolytes.

Original languageAmerican English
Pages (from-to)1295-1304
Number of pages10
JournalElectrochimica Acta
Issue number7-8
StatePublished - 1996

NREL Publication Number

  • NREL/JA-452-8100


  • Flat band
  • GaInP
  • Impedance
  • Interphase
  • Semiconductor


Dive into the research topics of 'Impedance Analysis of Surface Modified Ga0.5In0.5P-Aqueous Electrolyte Interface'. Together they form a unique fingerprint.

Cite this