DELAYED HOLE DISCHARGE AT TETRACENE CRYSTALAQUEOUS ELECTRODE INTERFACES,
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 coul/sq.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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1967
- Accession Number
- AD0652402
Entities
People
- Hartmut Kallmann
- Martin Pope
- Nicholas Geacintov
Organizations
- New York University