Abstract
New π-conjugated polymers based on dithienyl-diketopyrrolopyrrole (dtDPP) were synthesized by direct arylation polymerization, that is, poly(dtDPP), poly(dtDPP-FL), and poly(dtDPP-TPA). They revealed extremely low bandgaps, which could be achieved by controlling the donor–acceptor powers among the backbone building blocks. They were all thermally stable up to 250 °C and, furthermore, solution-processible in conventional ways, producing good-quality thin films. Poly(dtDPP) favorably self-assembled, forming an edge-on layer structure in nanoscale films, whereas the others were preferentially oriented within the film plane without any regular packing structures. All the dt-DPP-based polymers as active layers in devices demonstrated high-performance n-type digital memories (low switching voltage, high ON/OFF current ratio, and high stability) because of the narrow bandgaps. Moreover, the memory modes (nonvolatile and volatile) could be tuned by adjusting the donor–acceptor powers in the backbone. Overall, the dtDPP-based polymers are suitable for the low-cost mass production of n-type nonvolatile and volatile high performing memory devices. In addition, this study provides a guideline on how to achieve high-performance n-type digital memories by balancing the donor and acceptor powers among the chemical building blocks.
Published Version
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