Self-Assembled Porous Alumina Based Organic Nanotriode Arrays

We utilize ordered mesoporous alumina templates for solution processable electronics and demonstrate massively parallel organization of connected three-terminal vertical transistors. The vertical transistor device consists of a connected organic nanotriode array obtained using porous anodized alumina membranes of pore density ≈ 10⁹ pores/cm². In this structure, a collector-emitter diode gives rise to a space charge limited current, which can be controlled by a third intermediate porous base electrode to give transistor-like characteristics. We study the response characteristics along with 2D device simulations of this novel structure to indicate key parameters involved in the underlying mechanism. Device operation at single transistor level is verified by conductive atomic force microscopy, and the inherent short switching time scales of the vertical structure device is also demonstrated.