期刊
SCIENCE ADVANCES
卷 6, 期 5, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aaw8065
关键词
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资金
- Research Grants Council, University Grants Committee, Hong Kong, General Research Fund [GRF/12302817]
- Hong Kong Baptist University Inter-institutional Collaborative Research Scheme [RC-ICRS/15-16/04]
- State Key Laboratory of Environmental and Biological Analysis [SKLP_1920_P04]
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 similar to 10(13) 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.
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