氧化锌纳米颗粒增强的窄带隙聚合物近红外光响应晶体管  

ZnO nanoparticles enhanced near-infrared photodetection in organic phototransistors based on narrow bandgap polymer

作　　者：谭发 唐宇 彭金雷 廖英杰[2] 陈历相[1] 谭兴文[1] 张巧明[1] 雷衍连[1] Fa Tan;Yu Tang;Jinlei Peng;Yingjie Liao;Lixiang Chen;Xingwen Tan;Qiaoming Zhang;Yanlian Lei(School of Physical Science and Technology,Southwest University,Chongqing 400715,China;Key Laboratory of Advanced Display and System Applications(Ministry of Education),Shanghai University,Shanghai 200072,China)

机构地区：[1]西南大学物理科学与技术学院,重庆400715 [2]上海大学新型显示技术及应用集成教育部重点实验室,上海200072

出　　处：《科学通报》2020年第34期3984-3992,共9页Chinese Science Bulletin

基　　金：中央高校基本科研业务费专项(XDJK2020C056);西南大学“大学生创新创业训练计划”(X201910635199);上海大学新型显示教育部重点实验室开放课题资助。

摘　　要：近红外有机光响应晶体管因在热成像、夜视以及人体健康监测等方面的广泛应用而受到人们的密切关注.目前,近红外有机光响应晶体管的性能还不够高,离实际应用还有一定的距离.本研究选用窄带隙共轭聚合物半导体(DPP-DTT)作为光响应媒介,通过溶液加工方法,将聚合物制备成纳米网格,并将其应用于近红外光响应晶体管中.研究了基于DPP-DTT聚合物纳米网格的光响应晶体管的电学性质和近红外光响应性能,获得了336 A/W的光响应值R.在此基础上,在DPP-DTT纳米网格上引入电子受体材料——氧化锌(ZnO)纳米颗粒,增加了激子的分离效率,进一步提高了近红外光响应晶体管的器件性能,使得最高光响应值R提高到721 A/W,达到甚至超过了传统无机近红外光响应晶体管的性能水平.Highly sensitive near-infrared(NIR)photodetectors have attracted extensive attention due to their wide applications in thermal imaging,night vision and human health monitoring.Organic phototransistors(OPTs)are an important type of photodetector with three-terminal contact,which provides high sensitivity and tunable gain with an external quantum efficiency(EQE)>100%by controlling unbalanced charge transport through an optically controlled gate terminal.Thus,NIR OPTs are considered as a promising alternative NIR light detecting technology to conventional inorganic NIR phototransistors.The design and fabrication flexibility provided by the organic semiconductors and solution processes also have significant cost benefit,creating next-generation large-area,low-cost and flexible NIR photodetectors.However,now the performance of NIR-OPT is not high enough,which is still far from practical applications.Low field-effect mobility,limited exciton dissociation,and poor NIR light absorption are the main reasons to hamper the performance of NIR OPTs.A key technical development to circumvent this hurdle is to create an organic channel layer with ordered microstructure to provide high field-effect mobility and a smart device design to enhance exciton dissociation.In this work,an air stable conjugated semiconducting polymer of diketopyrrolopyrrole-dithienylthieno[3,2-b]thiophene(DPP-DTT)with narrow band gap was selected as the NIR light response medium.The DPP-DTT nanowire network was obtained by a solution-processed and scalable approach called polymer-matrix-mediated molecular self-assembly.The matrix polymer of polystyrene(PS)was selectively removed from the resulted DPP-DTT:PS blend film,leaving the pristine DPP-DTT nanowire network thin film as the active channel layer for the NIR OPTs.The electrical properties and NIR response of the OPTs based on DPP-DTT nanowire network were studied.It is found that the pristine DPP-DTT nanowire network layer exhibited a typical p-type field-effect transport,showing the hole mobility of>1

关 键 词：近红外光响应晶体管 聚合物半导体 氧化锌纳米颗粒 光响应值 

分 类 号：TN32[电子电信—物理电子学]