Accession Number : ADA091958


Title :   On the Role of Surface States in Semiconductor Electrode Photoelectrochemical Cells.


Descriptive Note : Technical rept. 1 Sep 80-31 Aug 81,


Corporate Author : TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY


Personal Author(s) : Bard,Allen J ; Fan,Fu-Ren F ; Gioda,Alberto S ; Nagasubramanian,G ; White,Henry S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a091958.pdf


Report Date : 27 Oct 1980


Pagination or Media Count : 22


Abstract : Surface states that occur at the semiconductor-liquid interface play an important role in the behaviour of that interface and affect the efficiency of photoelectrochemical solar devices. The nature of such states and evidence for their existence will be briefly reviewed. Their role in dark electron transfer reactions for redox couples with energies within the band-gap region and in mediating surface recombinations will be discussed. The importance of Fermi level pinning by surface states at moderate densities in GaAs and Si in controlling the open-circuit photovoltage and the observed electrochemical behaviour will be described. The effect of the surface pretreatment on the photoelectrochemical behaviour of p-GaAs and n-WSe2 will be demonstrated. (Author)


Descriptors :   *PHOTOCHEMICAL REACTIONS , *ELECTROCHEMISTRY , *ELECTRODES , *SURFACE CHEMISTRY , *P TYPE SEMICONDUCTORS , COUPLING(INTERACTION) , REPRINTS , REACTION KINETICS , INTERFACES , ENERGY , FERMI SURFACES , SOLAR CELLS , CIRCUITS , ELECTRON TRANSFER , PHOTOVOLTAIC EFFECT , BAND SPECTRA , OXIDATION REDUCTION REACTIONS


Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Solid State Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE