侧链含有不同电子受体的聚咔唑衍生物的合成及其WORM型存储性能

Synthesis and WORM Memory Performance of Polycarbazole Derivatives with Different Electron Acceptors in the Side Chain

利用Suzuki偶联反应合成了3种侧链含有不同电子受体的可溶性D-A型聚咔唑衍生物：聚[（9-（2-己基葵基）-9 H-咔唑）-（9-（4-硝基苯基）-9 H-咔唑）]（PCz-NO2）、聚[（9-（2-己基葵基）-9 H-咔唑）-（4-（9 H-咔唑-9-基）苯甲醛）]（PCz-CHO）和聚[（9-（2-己基葵基）-9 H-咔唑）-（4-（9 H-咔唑-9-基）苯甲腈）]（PCz-CN）。基于这3种聚合物的存储器件（器件结构：Al（200nm）/高分子（90nm）/氧化铟锡（ITO）均表现出典型的电双稳电子开关效应和非易失性一次写入多次读出（WORM）型存储性能。随着共轭聚合物光学带隙的增加[2.26eV（PCz-NO2）→2.79eV（PCzCHO）→3.20eV（PCz-CN）],相应器件的启动阈值电压逐渐增大（-1.70V→-1.81V→-1.89V）;而电流开关比（ON/OFF）则依次减小（6.63×10^4→4.08×10^4→5.68×10^3）。含氰基的聚咔唑衍生物需要的开启电压最大,展现出来的电流开关比在3种聚合物中则最小。

Three soluble D-A type polycarbazole derivatives with different electron acceptors in the side chain,including poly[（9-（2-hexyldecyl）-9 H-carbazole）-（9-（4-nitrophenyl）-9 H-carbazole）]（PCz-NO2）,poly[（9-（2-hexyldecyl）-9 H-carbazole）-（4-（9 H-carbazole-9-yl）benzaldehyde）]（PCz-CHO）,and poly[（9-（2-hexyldecyl）-9 H-carbazole）-（4-（9 H-carbazole-9-yl）benzonitrile）]（PCz-CN）,were synthesized through the Suzuki coupling reaction.These polymers-based electronic devices with a configuration of Al（200nm）/polymer（90nm）/Indium-Tin Oxide（ITO）had representative bistable electrical switching behavior and non-volatile write-once read-many-times（WORM）memory performance.When the optical bandgap of conjugated polymer was increased（2.26eV（PCz-NO2）→ 2.79eV（PCz-CHO）→ 3.20eV（PCz-CN））,the threshold voltage of the corresponding electronic device gradually increased（-1.70 V→-1.81 V→-1.89V）,whereas the ON/OFF current ratio was changed from 6.63×10^4 for PCz-NO2 to 4.08×10^4for PCz-CHO and to 5.68×10^3 for PCz-CN.Among these three derivatives,PCz-CN exhibited the biggest turn-on voltage and the lowest ON/OFF current ratio.