Figure 6
From: On Practical Charge Injection at the Metal/Organic Semiconductor Interface
(a) A schematic of two possible charge injection mechanisms induced by naturally oxidised contact metal: 1. Charge injection from the Fermi level of gold to the HOMO of pentacene via the V.B. of natural metal oxide and 2. Charge transfer from HOMO of pentacene to C.B. of natural metal oxide. The dashed line in red colour is a guide to eyes. The presented C.B. and V.B. bands show as wide gray bar because they consist of a few series of oxide bands such as natural aluminium oxide forms diffused V.B. and C.B. due to amorphous structure of natural oxide27,28,29,30,31,32,33. (b) A plot of thickness dependent for aluminium charge injection interlayer against contact resistance.
