[13p-N302-1~12] 12.1 Fabrications and Structure Controls

△ [13p-N302-10] Resistive Switching Control of Ferrocene-Containing Layer-by-Layer Nanofilms

〇(PC)Yuya Ishizaki¹, Akito Watanabe¹, Shunsuke Yamamoto¹, Masaya Mitsuishi¹ (1.Tohoku Univ.)

Keywords:polyelectrolyte, interdiffusion, proton migration

We report resistive switching control of ferrocene (Fc)-containing polyelectrolyte layer-by-layer (LbL) nanofilms. The switching layer was fabricated onto ITO electrodes by alternating deposition of Fc-containing branched polyethyleneimine (bPEI-Fc) and poly(styrene sulfonate) (PSS). PEDOT:PSS films were used as a top electrode. The resistive switching behavior of resistive switching devices was investigated by current density (J)–voltage (V) measurements. The resistive switching behavior was dependent strongly on the (1) Fc contents and (2) relative humidity (RH). This was attributed to proton migration mechanism between a resistive switching layer and a top PEDOT:PSS top electrode at low Fc contents. The RH has a great impact to the switching behavior at low Fc contents (8 mol%), indicating that polymer chain interdiffusion is the key factor on the proton migration mechanism. At a medium Fc content (16 mol%) in bPEI, the J–V characteristics changed dramatically from diode-like behavior to bistable resistive switching behavior, which has small effect on the RH. This indicates that the reversible redox reaction is the origin of the switching at this Fc content. The J–V characteristics was short-circuited at a high Fc content (21 mol%) due to electron conduction coupled with local chain motion in the nanofilm. Therefore, we successfully controlled resistive switching modes by Fc contents and RH.