Advanced

Manganese doped eco-friendly CuInSe2 colloidal quantum dots for boosting near-infrared photodetection performance

Guo, Ruiqi ; Meng, Jie ; Lin, Weihua LU ; Liu, Aqiang ; Pullerits, Tönu LU ; Zheng, Kaibo LU and Tian, Jianjun (2021) In Chemical Engineering Journal 403.
Abstract

CuInSe2 (CISe) colloidal quantum dots (QDs) display promising applications in photodetection especially within near-infrared (NIR) regions due to their high extinction coefficient and environmental-friendly. However, the high trap density and poor crystal quality introduced by the ternary structure result in low photodetection of CISe QDs devices. Herein, we dope transition metal manganese ions (Mn2+) into CISe QDs to tackle the above problems. Structural characterization results demonstrate the crystal quality of CISe QDs is improved by doping Mn2+ during the synthesis of QDs. The transient absorption (TA) spectroscopic study together with the space-charge-limited current (SCLC) measurements show the... (More)

CuInSe2 (CISe) colloidal quantum dots (QDs) display promising applications in photodetection especially within near-infrared (NIR) regions due to their high extinction coefficient and environmental-friendly. However, the high trap density and poor crystal quality introduced by the ternary structure result in low photodetection of CISe QDs devices. Herein, we dope transition metal manganese ions (Mn2+) into CISe QDs to tackle the above problems. Structural characterization results demonstrate the crystal quality of CISe QDs is improved by doping Mn2+ during the synthesis of QDs. The transient absorption (TA) spectroscopic study together with the space-charge-limited current (SCLC) measurements show the charge carrier lifetime of Mn-CISe QDs is much longer than that of the CISe QDs, due to the Mn2+ doping state serve as hole capturer forming a charge-compensated pair with the Cu2+ defect that makes the long-lived Cu2+ radiative recombination dominate. Furthermore, Mn2+ doping concurrently modifies the conduction band minimum and valence band maximum level of the QDs verified by the ultraviolet photoelectron spectroscopy (UPS), which determines the driving force for charge carrier transfer to acceptors. The optimal Mn2+ doping level (0.01 Mn:Cu feed ratio) balanced the above two factors in the QDs. The detector based on such Mn-CISe QDs exhibits responsivity of 30 mA/W and specific detectivity of 4.2 × 1012 Jones at near-infrared wavelength, the response speed of 0.76 µs, and suppressed dark current density of 1.6 × 10−10 A cm−2.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Charge carrier lifetime, CuInSe quantum dots, Environmental-friendly, Manganese ions, Near-infrared photodetector
in
Chemical Engineering Journal
volume
403
article number
126452
publisher
Elsevier
external identifiers
  • scopus:85088983150
ISSN
1385-8947
DOI
10.1016/j.cej.2020.126452
language
English
LU publication?
yes
id
1f89817c-b04a-428b-a666-70df4cdd83ad
date added to LUP
2020-08-11 10:56:31
date last changed
2020-08-11 10:56:31
@article{1f89817c-b04a-428b-a666-70df4cdd83ad,
  abstract     = {<p>CuInSe<sub>2</sub> (CISe) colloidal quantum dots (QDs) display promising applications in photodetection especially within near-infrared (NIR) regions due to their high extinction coefficient and environmental-friendly. However, the high trap density and poor crystal quality introduced by the ternary structure result in low photodetection of CISe QDs devices. Herein, we dope transition metal manganese ions (Mn<sup>2+</sup>) into CISe QDs to tackle the above problems. Structural characterization results demonstrate the crystal quality of CISe QDs is improved by doping Mn<sup>2+</sup> during the synthesis of QDs. The transient absorption (TA) spectroscopic study together with the space-charge-limited current (SCLC) measurements show the charge carrier lifetime of Mn-CISe QDs is much longer than that of the CISe QDs, due to the Mn<sup>2+</sup> doping state serve as hole capturer forming a charge-compensated pair with the Cu<sup>2+</sup> defect that makes the long-lived Cu<sup>2+</sup> radiative recombination dominate. Furthermore, Mn<sup>2+</sup> doping concurrently modifies the conduction band minimum and valence band maximum level of the QDs verified by the ultraviolet photoelectron spectroscopy (UPS), which determines the driving force for charge carrier transfer to acceptors. The optimal Mn<sup>2+</sup> doping level (0.01 Mn:Cu feed ratio) balanced the above two factors in the QDs. The detector based on such Mn-CISe QDs exhibits responsivity of 30 mA/W and specific detectivity of 4.2 × 10<sup>12</sup> Jones at near-infrared wavelength, the response speed of 0.76 µs, and suppressed dark current density of 1.6 × 10<sup>−10</sup> A cm<sup>−2</sup>.</p>},
  author       = {Guo, Ruiqi and Meng, Jie and Lin, Weihua and Liu, Aqiang and Pullerits, Tönu and Zheng, Kaibo and Tian, Jianjun},
  issn         = {1385-8947},
  language     = {eng},
  publisher    = {Elsevier},
  series       = {Chemical Engineering Journal},
  title        = {Manganese doped eco-friendly CuInSe<sub>2</sub> colloidal quantum dots for boosting near-infrared photodetection performance},
  url          = {http://dx.doi.org/10.1016/j.cej.2020.126452},
  doi          = {10.1016/j.cej.2020.126452},
  volume       = {403},
  year         = {2021},
}