Enhanced performance of solution-processable organic floating-gate transistor memories using binary small molecules dispersed polymer storage layers

Abstract

Exploring optical memory functions in nonvolatile organic field-effect transistor (OFET) memories with top-gate/bottom-contact (TG/BC) configurations can offer effective routes for developing printable, high-density organic memory circuits capable of multi-level data storage. In this paper, we report the enhancement in the performance of solution-processable TG/BC floating-gate OFET memory devices using binary small molecules dispersed polymer storage layers. A small amount of soluble fullerene is added to a solution-processable organic composite of soluble pentacene and polymer insulator to form the organic floating-gate structure in TG/BC organic transistors based on polythiophene. The solution-processed OFETs with the binary small molecules dispersed polymer storage layers exhibit good memory characteristics by programming under light illumination, and a large threshold voltage shift of approximately 35 V and a long extrapolated retention time of more than 109 s are achieved.