Peculiarities of holes injection into organic molecular solids

Averkiev, N. S.; Zakrevskii, V. A.; Rozhansky, I. V.; Sudar, N. T.
June 2009
Applied Physics Letters;6/8/2009, Vol. 94 Issue 23, p233308
Academic Journal
A microscopic mechanism of holes injection from metallic electrode into organic molecular solids (OMSs) in high electric field is proposed. A case is considered of ionization energy of the molecules exceeding work function of the metal. It is shown that the main contribution to the injection current comes from direct isoenergetic transitions (without interaction with phonons) from localized states in OMS to empty states in the metal. Strong dependence of the injection current on applied voltage originates from variation of the number of empty states available in the metal rather than by modification of the interface barrier shape.


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