Surface Engineering of Quantum Dots for Remarkably High Detectivity Photodetectors.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift


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 × 1013 Jones at 450 nm and 1 × 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.


Enheter & grupper
Externa organisationer
  • University of Science and Technology Beijing
  • Technical University of Denmark
  • University of Washington, Seattle

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Fysikalisk kemi
Sidor (från-till)3285–3294
TidskriftThe Journal of Physical Chemistry Letters
Utgåva nummer12
StatusPublished - 2018
Peer review utfördJa