Nanoscale Film Morphology and n‐Type Digital Memory Characteristics of π‐Conjugated Donor–Acceptor Alternating Copolymer Based on Thiophene and Thiadiazole Units

Various molecular weight π‐conjugated donor–acceptor polymers based on thiadiazole and thiophene units are investigated with respect to nanoscale film morphology and digital memory performance. Interestingly, all polymers reveal excellent n‐type digital permanent memory characteristics, which are governed by the combination of Ohmic and trap‐limited space charge limited conductions via a hopping process using thiadiazole and thiophene units as charge traps and stepping stones. The digital memory performance is significantly influenced by the film morphology details that vary with the polymer molecular weight as well as the film thickness. A higher population of face‐on structure formation, as well as higher molecular weight, provides a wider film thickness window of digital memory operation. Overall, π‐conjugated PBTDzTV polymers are suitable for the production of high‐performance, programmable n‐type permanent memory devices with very low power consumption. An excellent n‐type permanent memory characteristics of π‐conjugated donor–acceptor copolymers bearing thiophene and thiadiazole units is reported in this study. The digital memory performance is significantly influenced by the film morphology details varied with molecular weight and the film thickness. A wider film thickness window of memory operation is achieved with a higher population of face‐on structure formation and higher molecular weight.