摘要
通过在成本较低的活性层P3HT中引入少量在近红外波段有吸光能力的有机受体Y6制成倍增器件,Y6与P3HT发生分子间电荷转移,使得器件的响应波段拓展至1310 nm,在目前所报道的近红外倍增型有机光电探测器中具有明显优势。在空穴传输层与活性层之间引入原子级厚度的Al_(2)O_(3),极大降低了器件的暗电流,将器件由只能反向偏压响应改善到能够正反双向偏压响应。Al_(2)O_(3)修饰后器件在860 nm处的外量子效率为800%,比探测率为5.6×10^(11)Jones;1310 nm处器件的外量子效率为80.4%,比探测率为5.13×10^(10)Jones。
Objective The photomultiplication organic photodetector based on trap-assisted carrier tunneling mechanism not only has high sensitivity but also simplifies system design and effectively improves the weak light detection performance of the photodetector.At present,photomultiplication organic photodetectors mainly focus on the visible range and have relatively few responses in the near-infrared region.Detection in the near-infrared region has broad application prospects in many fields and the demand is becoming increasingly urgent.Intermolecular charge transfer is a low-cost method for achieving near-infrared absorption in organic photomultiplier detectors,which can effectively expand the response band of devices.However,the absorption is low and the response is very weak at long wavelengths.The photomultiplication type devices can amplify weak photocurrent signals and improve device performance.Therefore,by introducing a small amount of organic acceptor Y6 in the P3HT active layer,we fabricate a photomultiplication type organic photodetector.Due to the intermolecular charge transfer between P3HT and Y6,the response band of the device can be extended to 1310 nm,which is superior to the reported near-infrared multiplication type organic photodetectors.By introducing an atomic level thickness of Al_(2)O_(3)between the hole transport layer and the active layer,the device can work under both positive and negative biases.The external quantum efficiency of the device at 860 nm reaches 800%,with a detectivity of 5.6×10^(11)Jones.The external quantum efficiency of the device at 1310 nm reaches 80.4%,and the specific detectivity reaches 5.13×10^(10)Jones.This work can promote the development of near-infrared photomultiplication organic photodetector.Methods Firstly,the cleaned ITO substrates are dried by nitrogen gas and transferred to a glove box.PEDOT∶PSS is diluted with anhydrous ethanol in a volume ratio of 1∶9 and is span-coated onto the ITO substrate to form a hole transport layer.Then,the Al_(2)O_(3)interface
作者
胡依凡
滑羽璐
冀婷
石林林
崔艳霞
李国辉
Hu Yifan;Hua Yulu;Ji Ting;Shi Linlin;Cui Yanxia;Li Guohui(College of Physics,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;College of Electronic Information and Optical Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2024年第4期90-98,共9页
Acta Optica Sinica
基金
国家自然科学基金(U21A20496,61922060,62174117,62205235,12104334)
山西省重点研发计划项目(202102150101007)
山西省自然科学基金(20210302123154,20210302123169)
山西浙大新材料与化工研究院研发项目(2021SXFR008,2022SX-TD020)
中央引导地方科技发展资金项目(YDZJSX2021A012)
山西省省筹资金资助回国留学人员科研项目(2021-033)
吕梁市人才引进专项(Rc2020206,Rc2020207)。
关键词
探测器
分子间电荷转移
近红外波段
有机光电倍增探测器
双向偏压
界面修饰
detectors
intermolecular charge transfer
near infrared waveband
photomultiplication organic photodetectors
bidirectional biases
interface modification
