LAUSR

Functional polymers show great potential in information storage applications. However, most of these polymer-based memory devices demonstrate limited capacity because of binary memory characteristic. Herein, three novel donor–acceptor-type bipolar conjugated copolymers containing the naphthalene benzimidazole unit as the acceptor and fluorene/carbazol as the donor were synthesized by Suzuki cross-coupling reaction. When applied in memory devices, these as-prepared polymers exhibit unique ternary resistance switch memory behaviors with high switching current ratios of 1:101.5:104, 1:101.7:105.5, and 1:102.3:103.2, respectively, low threshold voltage of −1.00 V/–1.60 V, −1.00 V/–1.45 V, and −1.45 V/–2.00 V, respectively. The retention time exceeds 104 s and excellent stability over 103 cycles. The resistance switching mechanism is well explained by the charge trap model. This work provides a new direction for the rational design and fabrication of high-performance electrical storage devices with multistage ...