Nondispersive trap-limited electron transport in macroporous GaP

Electron transport in macroporous GaP networks permeated with electrolyte s olutions has been studied under steady-state conditions, by analysis of the photocurrent response upon a small-amplitude modulation of the light inten sity. It is found that electron transport is nondispersive, characterized b y a single transit time that depends on the thickness of the porous layer a nd the background light intensity. The transit time is determined by multip le trapping in interfacial states close to the electron Fermi level. The de nsity-of-states function in a considerable region of the band gap can be de termined from the transit time, when the energy of the electron Fermi level is changed by the background light intensity.