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Spray coated colloidal quantum dot films for broadband photodetectors

Song, Kaixuan ; Yuan, Jifeng ; Shen, Ting ; Du, Jiuyao ; Guo, Ruiqi ; Pullerits, Tönu LU and Tian, Jianjun (2019) In Nanomaterials 9(12).
Abstract

A technique for scalable spray coating of colloidal CdSeTe quantum dots (QDs) for photovoltaics and photodetector applications is presented. A mixture solvent with water and ethanol was introduced to enhance the adhesive force between QDs and the substrate interface. The performance of the detector reached the highest values with 40 spray coating cycles of QD deposition. The photodetectors without bias voltage showed broadband response in the wavelength range of 300–800 nm, and high responsivity of 15 mA/W, detectivity of more than 1011 Jones and rise time of 0.04 s. A large size QD-logo pattern film (10 × 10 cm2 ) prepared by the spray coating process displayed excellent uniformity of thickness and absorbance. The... (More)

A technique for scalable spray coating of colloidal CdSeTe quantum dots (QDs) for photovoltaics and photodetector applications is presented. A mixture solvent with water and ethanol was introduced to enhance the adhesive force between QDs and the substrate interface. The performance of the detector reached the highest values with 40 spray coating cycles of QD deposition. The photodetectors without bias voltage showed broadband response in the wavelength range of 300–800 nm, and high responsivity of 15 mA/W, detectivity of more than 1011 Jones and rise time of 0.04 s. A large size QD-logo pattern film (10 × 10 cm2 ) prepared by the spray coating process displayed excellent uniformity of thickness and absorbance. The large area detectors (the active area 1 cm2 ) showed almost the same performance as the typical laboratory-size ones (the active area 0.1 cm2 ). Our study demonstrates that the spray coating is a very promising film fabrication technology for the industrial-scale production of optoelectronic devices.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Photodetector, Quantum dots, Spray coating
in
Nanomaterials
volume
9
issue
12
article number
1738
publisher
MDPI AG
external identifiers
  • scopus:85076611681
  • pmid:31817681
ISSN
2079-4991
DOI
10.3390/nano9121738
language
English
LU publication?
yes
id
f1eb2669-2373-4367-9d13-f1e82c3ae4f4
date added to LUP
2020-01-07 14:52:08
date last changed
2024-06-12 07:31:42
@article{f1eb2669-2373-4367-9d13-f1e82c3ae4f4,
  abstract     = {{<p>A technique for scalable spray coating of colloidal CdSeTe quantum dots (QDs) for photovoltaics and photodetector applications is presented. A mixture solvent with water and ethanol was introduced to enhance the adhesive force between QDs and the substrate interface. The performance of the detector reached the highest values with 40 spray coating cycles of QD deposition. The photodetectors without bias voltage showed broadband response in the wavelength range of 300–800 nm, and high responsivity of 15 mA/W, detectivity of more than 10<sup>11</sup> Jones and rise time of 0.04 s. A large size QD-logo pattern film (10 × 10 cm<sup>2</sup> ) prepared by the spray coating process displayed excellent uniformity of thickness and absorbance. The large area detectors (the active area 1 cm<sup>2</sup> ) showed almost the same performance as the typical laboratory-size ones (the active area 0.1 cm<sup>2</sup> ). Our study demonstrates that the spray coating is a very promising film fabrication technology for the industrial-scale production of optoelectronic devices.</p>}},
  author       = {{Song, Kaixuan and Yuan, Jifeng and Shen, Ting and Du, Jiuyao and Guo, Ruiqi and Pullerits, Tönu and Tian, Jianjun}},
  issn         = {{2079-4991}},
  keywords     = {{Photodetector; Quantum dots; Spray coating}},
  language     = {{eng}},
  number       = {{12}},
  publisher    = {{MDPI AG}},
  series       = {{Nanomaterials}},
  title        = {{Spray coated colloidal quantum dot films for broadband photodetectors}},
  url          = {{http://dx.doi.org/10.3390/nano9121738}},
  doi          = {{10.3390/nano9121738}},
  volume       = {{9}},
  year         = {{2019}},
}