基于P3HT∶PC_(61)BM∶ITIC双受体三元有机光电探测器特性研究  

Characteristics of Ternary Organic Photodetectors Based on P3HT∶PC_(61)BM∶ITIC Dual Acceptors

作　　者：张如亮[1] 皮明超 安涛[1] 卢刚[1] 王倩[1] ZHANG Ruliang;PI Mingchao;AN Tao;LU Gang;WANG Qian(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：《光子学报》2023年第6期195-205,共11页Acta Photonica Sinica

基　　金：陕西省自然基金面上项目(No.2019JM251)。

摘　　要：为实现有机光电探测器对三基色(红、绿、蓝)的全响应以及器件性能的改善,研究了在P3HT∶PCBM活性层中,掺入非富勒烯受体ITIC实现光谱拓宽以及通过改善迁移率的平衡性和活性层表面形态,进而改善探测器性能的方法,着重研究了ITIC受体含量对探测器光电学性能的影响。在此基础上,获得了一个覆盖400~800 nm波长范围的三基色探测器,并且在低偏压−1.5 V下三基色(波长为630、530和460 nm)的外量子效率EQE和比探测率D*分别达到了56%、68%、52%和1.17×10^(12)Jones、1.4×10^(12)Jones、1.2×10^(12)Jones。结果表明:在P3HT:PC_(61)BM中混入适量的ITIC,不仅可将光谱拓宽到400~800 nm,改善器件的光学特性,而且还可以提高激子解离率和载流子收集率,降低混合薄膜中的双分子复合,使器件电学特性得到了明显改善。本文研究为研发宽光谱高探测率三基色有机光电探测器提供了一种新思路。Traditional Organ Photodetectors(OPDs)respond not enough in long-wave region,and it is difficult to support panchromatic detection from ultraviolet to infrared regions.In order to overcome the weak absorption ability,researchers adopted a ternary heterojunction structure and the material of complementary absorption spectra.Ternary polymer high-performance OPDs,with ultra-broad spectral response,in panchromatic range,have been reported by mixing the third component.However,there are still problems existing,such as low detection rate,insufficient photoelectric characteristics,and low spectral response uniformity,which are the current research focuses in OPDs.In order to realize panchromatic response to three primary colors,a ternary active layer with heterojunction structure was introduced to broaden spectra by mixing non-fullerene receptor ITIC in P3HT∶PCBM,which can improve detection performance by achieving mobility balance and surface morphology of active layer.In the proposed ternary active layer,polymer P3HT was used as the donor,while fullerene PC61BM and non-fullerene ITIC were adopted as acceptors.The influence of ITIC acceptor mass ratio on photoelectric performance of the detector was mainly studied.The optical characteristic analysis of proposed ternary OPDs indicates that the main material P3HT∶PC_(61)BM film has good light absorption ability from 400 to 600 nm.Moreover,ITIC molecules have stronger absorption abilty in red light region,and main absorption peak is located at 702 nm.Ternary blend film produces a new absorption peak in the range of 600 nm to 750 nm.With gradual increase of ITIC ratio,the absorption ability of blend film in long-wave region enhances.By changing the ratio of PC61BM and ITIC,the absorption intensity of long-wave region can be effectively adjusted.In electrical characteristic,the J-V tests show that dark current density gradually reduces as dual acceptors increase Under red light,the bright current density increases first and then decreases with increasing of the mass rat

关 键 词：有机光电探测器 体异质结 三元活性层 激子解离 ITIC 

分 类 号：O471.4[理学—半导体物理]