Jian-bin WANG, Xiao-sheng TANG, Bi ZHOU, et al. High Performance Broadband Photomultiplication-type Quaternary Organic Photodetectors. [J]. Chinese Journal of Luminescence 42(7):1057-1064(2021)
Jian-bin WANG, Xiao-sheng TANG, Bi ZHOU, et al. High Performance Broadband Photomultiplication-type Quaternary Organic Photodetectors. [J]. Chinese Journal of Luminescence 42(7):1057-1064(2021) DOI： 10.37188/CJL.20210142.
High Performance Broadband Photomultiplication-type Quaternary Organic Photodetectors增强出版
Quaternary photomultiplication(PM)-type organic photodetectors(OPDs) with a structure of ITO/PEDOT∶PSS/active layer/Al were fabricated by a solution-processing method. The bulk-heterojunction active layer of devices was composed of P3HT∶PTB7-Th∶IEICO∶PC,71,BM with a weight ratio of 90∶10∶0.5∶0.5. As the bias voltage increases, the external quantum efficiencies(EQEs) of the devices are much larger than 100% and exhibit a wide spectral response range of 300-850 nm. At 330 nm and 780 nm, the highest EQE and responsivity of the devices are 773000% and 2 057 A·W,-1, and 311000% and 1 956 A·W,-1, respectively, which are one of the highest EQEs and responsivity values in ultraviolet and near-infrared areas for the OPDs. Under -25 V bias, compared to the ternary devices with a structure of ITO/PEDOT∶PSS/P3HT∶PTB7-Th∶IEICO(90∶10∶1)/Al, the average EQE(388167%), responsivity(1 604 A·W,-1,) and detectivity(3.6×10,13, Jones) of quaternary devices are more than 0.5, 0.5, 0.4 times larger, respectively, effectively improving the detecting capacity of devices on weak light. The above results provide an effective strategy for preparing multi-element broadband PM-type OPDs to improve the detecting ability of the devices on weak light, especially improving the response and detecting ability of the devices in ultraviolet and near-infrared regions.
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