Accession Number:

AD0652402

Title:

DELAYED HOLE DISCHARGE AT TETRACENE CRYSTALAQUEOUS ELECTRODE INTERFACES,

Descriptive Note:

Corporate Author:

NEW YORK UNIV N Y

Report Date:

1967-01-01

Pagination or Media Count:

7.0

Abstract:

A delayed neutralization of photoinjected holes at anthraceneaqueous electrode interfaces has been previously noted. The same effect also occurs in tetracene crystals with aqueous electrodes. The delayed discharge is much more pronounced and can be observed at frequencies as low as 0.01 cps. Up to 0.0000001 coulsq.cm of charge can be stored at or very near the negative, dark electrode. It appears that holes are accumulated in shallow surface states. These surface states appear to be related to surface defects or impurities since there is such a large variation with different crystals. Furthermore, the hole storage is associated with the presence of oxygen. Preliminary experiments show that the amount of charge, Q, can be decreased by 75 if the crystal surface and H2O electrode are subjected even to a crude degassing procedure. Re-exposing the surface to air and using ordinary distilled water restores the previous value of Q. The holes probably form a weak dipole layer with the negative ions in the solution.

Subject Categories:

  • Radiation and Nuclear Chemistry
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE