Low-Temperature Electron Injection and Space-Charge-Limited Transients in Anthracene Crystals

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Abstract
A solid electrode has been prepared able to efficiently inject electrons into anthracene crystals at temperatures as low as 77°K. Currents as high as 10−2 A·cm−2 may be injected with no evidence of saturation. No activation energy is associated with the injection process, the current–temperature dependence is determined only by the trap distribution of the crystal. Using this electrode the temperature dependence of the electron mobility has been measured from 300 to 170°K. The results corroborate those from phototechniques, namely, as temperature decreases the electron mobility increases along the a and b crystal axes and decreases slightly along the c′ axes. At low temperatures, a second maximum in the current transient along the a and b directions is observed.