Advanced

Surface Engineering of Quantum Dots for Remarkably High Detectivity Photodetectors.

Shen, Ting ; Li, B ; Zheng, Kaibo LU ; Pullerits, Tönu LU ; Cao, J and Tian, Jianjun (2018) In The Journal of Physical Chemistry Letters 9(12). p.3285-3294
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Letters
volume
9
issue
12
pages
3285 - 3294
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85048106555
ISSN
1948-7185
DOI
10.1021/acs.jpclett.8b01255
language
English
LU publication?
yes
id
8c51ef58-d76f-4133-90d5-47f971122425
date added to LUP
2019-04-27 14:16:17
date last changed
2019-11-20 05:41:43
@article{8c51ef58-d76f-4133-90d5-47f971122425,
  abstract     = {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.},
  author       = {Shen, Ting and Li, B and Zheng, Kaibo and Pullerits, Tönu and Cao, J and Tian, Jianjun},
  issn         = {1948-7185},
  language     = {eng},
  number       = {12},
  pages        = {3285--3294},
  publisher    = {The American Chemical Society (ACS)},
  series       = {The Journal of Physical Chemistry Letters},
  title        = {Surface Engineering of Quantum Dots for Remarkably High Detectivity Photodetectors.},
  url          = {http://dx.doi.org/10.1021/acs.jpclett.8b01255},
  doi          = {10.1021/acs.jpclett.8b01255},
  volume       = {9},
  year         = {2018},
}