Investigation of acceptor layer in inverted organic multifunction diodes

Abstract

Organic multifunction diodes (MFDs) with light-emitting, photovoltaic, and photo sensing functions were demonstrated using a stack of N, N'-ditridecylperylene-3,4,9,10-tetracarboxylic diimide (PTCDI-C₁₃) and 2,7-di(9H-fluoren-2-yl)benzo[lmn][3,8]-phenanthroline-1,3,6,8(2H,7H)-tetraone (HFl-NDI) as an electron transporter/acceptor and 5,6,11,12-tetraphenylnaphthacene (rubrene) as an emitter/donor. Polyethylenimine ethoxylated (PEIE) as an electron injection layer was introduced in an inverted-structured device. By using the inverted structure and introducing HFl-NDI to reduce the absorption in the acceptor layer, an increase in the emission of EL and an increase in the short-circuit current density in the OSC were obtained.