摘要
近红外光探测能力强的光电探测器更有利于检测人体心率,而且探测范围覆盖红光与近红外光的宽带响应光电探测器能用于检测血氧饱和度,因此提升宽带响应光电探测器的红光与近红外光探测能力具有重要意义。然而,经典的二元体异质结宽带响应倍增型有机光电探测器通常由于活性层中给体/受体比例差异较大,导致器件对红光与近红外光的响应能力较弱甚至没有响应。本文通过用少量给体材料PCE10替代活性层P3HT∶IEICO‐4F(100∶1)中部分P3HT的方法,制备了结构为ITO/PEDOT∶PSS/P3HT∶PCE10∶IEICO‐4F(90∶10∶1)/Al的体异质结三元倍增型有机光电探测器。-20 V偏压下,三元器件获得紫外到近红外(330~810 nm)响应较均匀的EQE光谱,并且器件在660 nm和810 nm处的EQEs(134000%和147000%)是相同条件下二元器件的78倍和106倍,相应的探测灵敏度(5.4×10^(13)Jones和7.27×10^(13)Jones)分别提升了26倍和36倍。三元器件的红光和近红外光探测能力得到显著提升,为制备用于人体心率与血氧饱和度检测的高性能光电探测器提供了策略。
Photodetectors with strong near-infrared response are more conducive to detecting human heart rate.Furthermore,broadband photodetectors with a response range covering both red and near-infrared region can be used to detect blood oxygen saturation.Therefore,improving the red and near-infrared response capabilities of broadband photodetectors is of great significance.However,classic binary bulk-heterojunction broadband photomultiplicationtype organic photodetectors typically exhibit weak or even no response to red and near-infrared light due to significant ratio-difference between donor and acceptor in the active layer.This paper fabricates ternary bulk-heterojunction photomultiplication-type organic photodetectors with a structure of ITO/PEDOT∶PSS/P3HT∶PCE10∶IEICO-4F(90∶10∶1)/Al by using a small amount of donor material PCE10 to replace some of P3HT in the active layer of P3HT∶IEICO-4F(100∶1).Under-20 V bias,the ternary devices obtain a relatively even EQE spectrum from ultraviolet to near-infrared(330-810 nm),with the EQEs at 660 nm and 810 nm(134000%and 147000%)being 78 and 106 times as large as those of the binary devices under same conditions,and corresponding detectivity values(5.4×10^(13)Jones and 7.27×10^(13)Jones)being increased by 26 and 36 times,respectively.The red and near-infrared light detection capabilities of ternary devices have been significantly improved,providing a strategy for fabricating high-performance photodetectors to detect human heart rate and blood oxygen saturation.
作者
王建彬
唐孝生
周笔
曾夏辉
黎金城
周赢武
WANG Jianbin;TANG Xiaosheng;ZHOU Bi;ZENG Xiahui;LI Jincheng;ZHOU Yingwu(College of Physics&Electronics Information Engineering,Minjiang University,Fuzhou 350108,China;College of Optoelectronic Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)
出处
《发光学报》
EI
CAS
CSCD
北大核心
2023年第12期2222-2230,共9页
Chinese Journal of Luminescence
基金
福建省发树慈善基金会资助研究专项(MFK23005)
福建省自然科学基金(2022J011126)。
关键词
近红外
心率
血氧饱和度
体异质结
倍增型有机光电探测器
三元
near-infrared
heart rate
blood oxygen saturation
bulk-heterojunction
photomultiplication-type organic photodetector
ternary
