Molecular orbital energy level plays a vital role in the storage performance of memory materials. Fixing LUMO levels, reasonable regulation of HOMO level can effectively optimize the memory behaviors of storage devices. Therefore, two triazole-based donor-acceptor contained polyimides (TZMPDA-6FDA, TZAPDA-6FDA) with similar LUMO levels but different HOMO levels are designed and synthesized by introducing the pendant groups with different electron-donating ability. The LUMO levels of TZMPDA-6FDA and TZAPDA-6FDA are -1.98 and -1.99 eV, respectively. In comparison with TZMPDA-6FDA, the HOMO level of TZAPDA-6FDA increased from -5.32 to -5.23 eV due to the stronger electron-donating ability of diethylamino group than methoxy group. The increased HOMO level can reduce the energy barriers for charge carriers injection and migration, and thus effectively decrease the threshold voltage of memory devices from -2.4 to -1.8 V. The high-lying HOMO levels can facilitate the intra- and inter-molecular charge transfer, which benefit to optimize the performance of the memory device.

分子轨道能级在存储材料的存储性能中起着至关重要的作用。固定LUMO级别，合理调节HOMO级别可以有效地优化存储设备的存储行为。因此，通过引入具有不同供电子能力的侧基，设计并合成了两种基于三唑的供体受体，它们具有相似的LUMO水平但具有不同的HOMO水平的聚酰亚胺（TZMPDA-6FDA，TZAPDA-6FDA）。TZMPDA-6FDA和TZAPDA-6FDA的LUMO水平分别为-1.98和-1.99 eV。与TZMPDA-6FDA相比，由于二乙氨基的电子供电能力强于甲氧基，因此TZAPDA-6FDA的HOMO含量从-5.32 eV增加到-5.23 eV。增加的HOMO能级可以减少电荷载流子注入和迁移的能垒，