共混诱导制备圆偏振光突触晶体管

Preparation of circularly polarized synaptic transistor by blending induction

集成圆偏振光(CPL)识别及记忆学习功能的光子人工突触(PAS)器件对高级神经形态视觉系统具有重要价值。本文通过简单的共混策略及器件多层结构设计,制备了可见光范围内的CPL突触晶体管器件。实验证明,通过手性小分子(4-[[4-(己氧基)苯甲酰基]氧基]-1,1’-[1,1’-联萘]-2,2’-二酯)苯甲酸(S6N)或(R)-(9CI)-4-(己氧基)-[1,1’-联萘]-2,2’-二(氧羰基-4,1-亚苯基)苯甲酸(R6N)与聚(9,9-二辛基芴-2,7-二基)(PFO)共混制备的薄膜经过手性诱导和退火后具有强烈的手性光学活性。以该共混膜为手性层、联噻吩-氮杂异靛蓝-含氮苯并二呋喃二酮给体-受体共轭聚合物(C13P3.75)为电荷传输层,制备的双层光电晶体管能够在405 nm CPL照射下进行多种生物突触行为的模拟。成功模拟了兴奋性突触后电流(EPSC)、双脉冲易化(PPF)及短期记忆(STM)到长期记忆(LTM)的转变。实验结果表明,制备的有机场效应晶体管(OFET)器件具有优异的CPL区分能力,对405 nm CPL的光电流不对称因子达到了-0.492。

Photonic artificial synapse(PAS)devices with the functions of circularly polarized light(CPL)recognition and memory learning are of great value to advanced neuromorphological vision systems.In this study,CPL synaptic transistor devices in the visible range are fabricated by simple blending strategy and multilayer structure design.Experiments show that films prepared by blending chiral small molecules benzoic acid,4-[[4-(hexyloxy)benzoyl]oxy]-,1,1'-[1,1'-binaphthalene]-2,2'-diyl ester(S6N)or benzoic acid,4-(hexyloxy)-,[1,1'-binaphthalene]-2,2'-diylbis(oxycarbonyl-4,1-phenylene)ester,(R)-(9CI)(R6N)with poly(9,9-dioctylfluorene-2,7-diyl)(PFO)had strong chiral optical activity after annealing induction.Using the blend film as the chiral layer and the dithiophene-azaindigo-nitrogen-containing benzodifurandione donor-acceptor conjugated polymer(C13P3.75)as the charge transport layer,the prepared double-layer phototransistor can simulate various biological synaptic behaviors under 405 nm CPL irradiation.Excitatory postsynaptic current(EPSC),paired-pulse facilitation(PPF)and the transition from short-term memory(STM)to long-term memory(LTM)were successfully simulated.The experimental results show that the device has excellent CPL discrimination ability,and the photocurrent asymmetry factor of 405 nm CPL reaches-0.492.