Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 9, Issue 12, Pages 3285-3294Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.8b01255
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Funding
- National Science Foundation of China [51774034, 51772026, 51611130063]
- Beijing Natural Science Foundation [2182039]
- Fundamental Research Funds for the Central Universities [FRF-BD-16-012A]
- Swedish Foundation for International Cooperation in Research and High Education (STINT) [CH2015-6232]
- Swedish Research Council (VR) [2017-05337]
- Independent Research Fund of Denmark (DFF) [7026-00037A]
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Ternary alloyed CdSexTe1-x colloidal QDs trap-passivated by iodide-based ligands (TBAI) are developed as building blocks for UV-NIR photodetectors. Both the few surface traps and high loading of QDs are obtained by in situ ligand exchange with TBAI. The device is sensitive to a broad wavelength range covering the UV-NIR region (300-850 nm), showing an excellent photoresponsivity of 53 mA/W, a fast response time of <<0.02s, and remarkably high detectivity values of 8 X 10(13) Jones at 450 nm and 1 X 1013 Jones at 800 nm without an external bias voltage. Such performance is superior to what has been reported earlier for QD-based photodetectors. The photodetector exhibits excellent stability, keeping 98% of photoelectric responsivity after 2 months of illumination in air even without encapsulation. In addition, the semitransparent device is successfully fabricated using a Ag nanowires/polyimide transparent substrate. Such self-powered photodetectors with fast response speed and a stable, broad-band response are expected to function under a broad range of environmental conditions.
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