Near-infrared and visible light dual-mode organic photodetectors

Lan，Zhaojue1,2; Lei，Yanlian1; Chan，Wing Kin Edward1; Chen，Shuming2; Luo，Dan2; Zhu，Furong1

2020-01-31

10.1126/sciadv.aaw8065

Science Advances   影响因子和分区

23752548

2375-2548

We report a dual-mode organic photodetector (OPD) that has a trilayer visible light absorber/optical spacer/near-infrared (NIR) light absorber configuration. In the presence of NIR light, photocurrent is produced in the NIR light- absorbing layer due to the trap-assisted charge injection at the organic/cathode interface at a reverse bias. In the presence of visible light, photocurrent is produced in the visible light-absorbing layer, enabled by the trap-assisted charge injection at the anode/organic interface at a forward bias. A high responsivity of >10 A/W is obtained in both short and long wavelengths. The dual-mode OPD exhibits an NIR light response operated at a reverse bias and a visible light response operated at a forward bias, with a high specific detectivity of ∼10 Jones in both NIR and visible light ranges. A bias-switchable spectral response OPD offers an attractive option for applications in environmental pollution detection, bioimaging process, wellness, and security monitoring in two distinct bands.

SCI ; EI

英语

NI期刊

通讯

[SKLP-1920-P04] ; Hong Kong Baptist University[RC-ICRS/15-16/04] ; University Research Committee, University of Hong Kong[GRF/12302817]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:000512904600005

American Association for the Advancement of Science

20200608139735

Infrared devices ; Photodetectors ; Photons ; Pollution control

Light/Optics:741.1 ; Atomic and Molecular Physics:931.3

2-s2.0-85078959997

Scopus

1.Department of Physics,Research Centre of Excellence for Organic Electronics,Institute of Advanced Materials,State Key Laboratory of Environmental and Biological Analysis,Hong Kong Baptist University,Kowloon Tong,Hong Kong
2.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Lan，Zhaojue,Lei，Yanlian,Chan，Wing Kin Edward,et al. Near-infrared and visible light dual-mode organic photodetectors[J]. Science Advances,2020,6(5).

Lan，Zhaojue,Lei，Yanlian,Chan，Wing Kin Edward,Chen，Shuming,Luo，Dan,&Zhu，Furong.(2020).Near-infrared and visible light dual-mode organic photodetectors.Science Advances,6(5).

Lan，Zhaojue,et al."Near-infrared and visible light dual-mode organic photodetectors".Science Advances 6.5(2020).