摘要
利用基于[1,2,3]三唑并[4,5-f]异吲哚-5,7(2H,6H)-二酮(TzBI)共轭聚合物PTzBI-Cl为给体,非富勒烯小分子Y6DT为受体,制备基于倒装结构的有机本体异质结光探测器.基于高分子量聚合物PTzBI-Cl-H制备的器件比低分子量材料制备的器件具有更低的暗电流和更高的光探测性能.通过对PTzBI-Cl:Y6DT进行薄膜厚度调控,在保持较高的外量子效率的同时显著地降低了暗电流密度,提高了器件探测率.活性层厚度为330 nm时,光探测器在−0.1 V偏压下的暗电流为2.3×10^(−10)A·cm^(−2),在±2 V范围内整流比为10^(6).在−0.1 V偏压下器件在500~880 nm的工作波段的比探测率均高于10^(13)cm·Hz^(−1/2)·W^(−1),最大值位于830 nm处达到6.1×10^(13)cm·Hz^(−1/2)·W^(−1),R值为0.52 A·W^(−1),是目前报道的在830 nm波长二极管型倒装有机光探测最高值之一.
The wide-bandgap polymer(PTzBI-Cl)contains an electron-deficient[1,2,3]triazolo[4,5-f]isoindole-5,7(2H,6H)-dione(TzBI)unit,which can be used as an electron-donating polymer to combine with a non-fullerene acceptor,namely Y6DT,to fabricate organic photodetectors(OPDs)that bear inverted device structure.The devices based on high molecular weight PTzBI-Cl-H exhibited lower dark current density and thus superior photodetectivity.The dark current density can be significantly suppressed by optimizing the film thickness of active layer,while the external quantum efficiency can be maintained at a relatively high level.The combination of these advantages leads to an obvious increase in the detectivity.When the active layer thickness increased up to 330 nm,the device exhibited a very low dark current density of 2.3×10^(−10)A·cm^(−2) at−0.1 V,and the rectification ratio is 10^(6) in the range of±2 V.Under−0.1 V bias,the detectivity of the device is higher than 10^(13) cm·Hz^(−1/2)·W^(−1) in the range of 500-880 nm,with a maximum of 6.1×10^(13)cm·Hz^(−1/2)·W^(−1) and a responsivity of 0.52 A·W^(−1) at a working wavelength of 830 nm,both of which are among the highest values of thus far reported OPDs based on the inverted structure at the working wavelength of 830 nm without extra gains.
作者
邱红
钟知鸣
李美静
应磊
俞钢
黄飞
曹镛
Hong Qiu;Zhi-ming Zhong;Mei-jing Li;Lei Ying;Gang Yu;Fei Huang;Yong Cao(Institute of Polymer Optoelectronic Materials and Devices,State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640)
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2022年第4期433-440,共8页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号51933003,22005102)
东莞市科技计划(项目号2019622163009,2018607201002)资助.
关键词
有机光探测器
近红外
分子量
厚膜器件
Organic photodetector
Near infrared
Molecular weight
Thick-film devices
