基于苯并二噻吩聚合物所制备的三元光电探测器的特性  

Characteristics of ternary photodetectors based on benzodithiophene polymers

作　　者：安涛[1] 薛佳伟 王永强 An Tao;Xue Jia-Wei;Wang Yong-Qiang(College of Automation and Information Engineering,Xi’an University of Technology,Xi’an 710048,China)

机构地区：[1]西安理工大学自动化与信息工程学院,西安710048

出　　处：《物理学报》2021年第5期304-313,共10页Acta Physica Sinica

基　　金：陕西省自然科学基础研究计划项目(批准号:2019JM-251)资助的课题.

摘　　要：本文采用P3HT∶PTB7∶PC^(61)BM为活性层,制备了覆盖可见光范围的三元体异质结有机光电探测器(organic photodetectors,OPDs).利用原子力显微镜、紫外可见吸收光谱和荧光光谱等手段研究了PTB7添加到P3HT∶PC61BM体系中对OPDs光学和电学性质的影响,发现当P3HT∶PTB7∶PC61BM的质量比为8∶2∶10时,三元混合层的响应光谱扩展到780 nm,OPDs的响应度R在630,530,460 nm的光照和–1 V偏压下分别达到178,291,241 mA/W,比探测率D^(*)达到10^(12) Jones,并与课题组之前成果P3HT∶PBDT-TT-C∶PC61BM为活性层的三元有机光电探测器做了对比.分析了两种基于苯并[1,2-b∶4,5-b]二噻吩(BDT)单元的聚合物PTB7与PBDT-TT-C分别添加到同一体系P3HT∶PC_(61)BM中产生的器件性能差距的现象,解释了PTB7由于氟原子的引入,对混合薄膜微观形貌的影响和对薄膜中光生载流子迁移率的提升的原因.这为制备性能更好的有机光电探测器提供了理论依据和方法.In this paper,P3HT∶PTB7∶PC61BM is used as an active layer to prepare a ternary heterojunction organic photodetector covering the visible light range.The effects of PTB7 added to P3HT∶PC61BM system on the optical and electrical properties of organic photodetectors(OPDs)are studied by atomic force microscopy,ultraviolet-visible absorption spectroscopy and fluorescence spectroscopy.It is found that when the mass ratio of P3HT∶PTB7∶PC61BM is 8∶2∶10,the response spectrum of the ternary mixed layer extends to 780 nm,and the responsivity(R)of OPDs reaches 178,291,and 241 mA/W respectively under 630,530,and 460 nm light and–1 V bias,and the specific detection rate(D^(*))reaches 1012 Jones,and the above results are compared with the research group’s previous results about P3HT∶PBDT-TT-C∶PC61BM as the active layer of ternary organic photodetector.The phenomenon of the device performance gap caused by adding two polymers PTB7 and PBDT-TT-C based on benzo[1,2-b∶4,5-b]dithiophene(BDT)units into the same system P3HT∶PC_(61)BM is analyzed.The effect of PTB7 on the micro-morphology of the mixed film due to the introduction of fluorine atoms and the reason for the increase in the mobility of photogenerated carriers in the film are explained.This OPD with better preparation performance provides a theoretical basis and method.

关 键 词：有机光电探测器 三元体异质结 激子解离 微观形貌 

分 类 号：TQ317[化学工程—高聚物工业] TN36[电子电信—物理电子学]