Organic near-infrared photodetectors with photoconductivity-enhanced performance

Zhang, Siwei1,2; Li, Zhenlong3; Li, Jingzhou4; Wang, Bingzhe5; Chen, Fang6; Li, Xubiao3; Liu, Shunjie7; Lam, Jacky W. Y.1,2; Xing, Guichuan5; Li, Jiangyu6; Zhao, Zheng8; Kang, Feiyu3; Wei, Guodan3; Tang, Ben Zhong1,2,8,9

2023-04-01

10.1002/agt2.345

AGGREGATE   Impact Factor & Quartile

2692-4560

Organic near-infrared (NIR) photodetectors with essential applications in medical diagnostics, night vision, remote sensing, and optical communications have attracted intensive research interest. Compared with most conventional inorganic counterparts, organic semiconductors usually have higher absorption coefficients, and their thin active layer could be sufficient to absorb most incident light for effective photogeneration. However, due to the relatively poor charge mobility of organic materials, it remains challenging to inhibit the photogenerated exciton recombination and effectively extract carriers to their respective electrodes. Herein, this challenge was addressed by increasing matrix conductivities of a ternary active layer (D-A-D structure NIR absorber [2TT-oC6B]:poly(N,N '-bis-4-butylphenyl-N,N '-bisphenyl)benzidin [PolyTPD]:[6,6]-phenyl-C-61-butyric acid methyl ester [PCBM] = 1:1:1) upon in situ incident light illumination, significantly accelerating charge transport through percolated interpenetrating paths. The greatly enhanced photoconductivity under illumination is intrinsically related to the unique donor-acceptor molecular structures of PolyTPD and 2TT-oC6B, whereas stable intermolecular interaction has been verified by systematic molecular dynamics simulation. In addition, an ultrafast charge transfer time of 0.56 ps from the NIR aggregation-induced luminogens of 2TT-oC6B absorber to PolyTPD and PCBM measured by femtosecond transient absorption spectroscopy is beneficial for effective exciton dissociation. The solution-processed organic NIR photodetector exhibits a fast response time of 83 mu s and a linear dynamic range value of 111 dB under illumination of 830 nm. Therefore, our work has opened up a pioneering window to enhance photoconductivity through in situ photoirradiation and benefit NIR photodetectors as well as other optoelectronic devices.

AIEgens organic NIR photodetectors photoconductivity

ESCI

English

Others

National Natural Science Foundation of China["21788102","03012800001"] ; Research Grants Council of Hong Kong["16307020","16305518","16305618","C6014-20W"] ; Innovation and Technology Commission[ITC-CNERC14SC01] ; Shenzhen Science and Technology Innovation Committee["JCYJ20190809172615277","GJHZ20210705143204013"] ; Science and Technology Development Fund of Macao SAR[FDCT-0044/2020/A1] ; Guangdong Basic and Applied Basic Research Foundation[2020A1515111065]

Chemistry ; Materials Science

Chemistry, Multidisciplinary ; Chemistry, Physical ; Materials Science, Multidisciplinary

WOS:000977843400001

WILEY

Web of Science

1.Hong Kong Univ Sci & Technol, Hong Kong Branch Chinese Natl Engn Res Ctr Tissue, Dept Chem, Kowloon, Hong Kong, Peoples R China
2.Hong Kong Univ Sci & Technol, Guangdong Hong Kong Macro Joint Lab Optoelect & Ma, Hong Kong, Guangdong, Peoples R China
3.Tsinghua Univ, Tsinghua Berkeley Shenzhen Inst, Inst Mat Sci, Tsinghua Shenzhen Int Grad Sch, Shenzhen, Peoples R China
4.Univ Chinese Acad Sci, Hangzhou Inst Adv Study, Hangzhou, Peoples R China
5.Univ Macau, Inst Appl Phys & Mat Engn, Ave Univ, Taipa, Macau, Peoples R China
6.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen, Peoples R China
7.Chinese Acad Sci, Changchun Inst Appl Chem, Changchun, Peoples R China
8.Chinese Univ Hong Kong, Shenzhen Inst Aggregate Sci & Technol, Sch Sci & Engn, Shenzhen, Peoples R China
9.South China Univ Technol, Ctr Aggregat Induced Emiss, Guangzhou, Peoples R China

Zhang, Siwei,Li, Zhenlong,Li, Jingzhou,et al. Organic near-infrared photodetectors with photoconductivity-enhanced performance[J]. AGGREGATE,2023.

Zhang, Siwei.,Li, Zhenlong.,Li, Jingzhou.,Wang, Bingzhe.,Chen, Fang.,...&Tang, Ben Zhong.(2023).Organic near-infrared photodetectors with photoconductivity-enhanced performance.AGGREGATE.

Zhang, Siwei,et al."Organic near-infrared photodetectors with photoconductivity-enhanced performance".AGGREGATE (2023).