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Dye-sensitized ternary copper chalcogenide nanocrystals : optoelectronic properties, air stability, and photosensitivity

Sonam Maiti, Santanu Maiti, Ali Khan (UGent) , Andreas Wolf, Dirk Dorfs, Iwan Moreels (UGent) , Frank Schreiber and Marcus Scheele
(2019) CHEMISTRY OF MATERIALS. 31(7). p.2443-2449
Author
Organization
Abstract
We report on the effect of ligand exchange of Cu2SeyS1-y and Cu2Se nanocrystals (NCs) with the organic pi system cobalt beta-tetraaminophthalocyanine (CoTAPc) and analyze the changes in the structural, optical, and electric properties of thin films of these hybrid materials. A strong ligand interaction with the surface of the NCs is revealed by UV/vis absorption and Raman spectroscopy. Grazing incidence small-angle X-ray scattering studies show a significant contraction in the interparticle distance upon ligand exchange. For copper-deficient Cu2-xSe, this contraction has a negligible effect on electric transport, whereas for copper-deficient Cu2-xSeyS1-y, the conductivity increases by 8 orders of magnitude and results in metal-like temperature-dependent transport. We discuss these differences in the light of varying contributions of electronic vs ionic transport in the two materials and highlight their effect on the stability of the transport properties under ambient conditions. With photocurrent measurements, we demonstrate high optical responsivities of 200-400 A W-1 for CoTAPc-capped Cu2SeyS1-y and emphasize the beneficial role of the organic pi-system in this respect, which acts as an electronic linker and an optical sensitizer at the same time.
Keywords
SURFACE-PLASMON RESONANCE, CONTROLLABLE SYNTHESIS, CU2-XSE NANOCRYSTALS, CATION-EXCHANGE, THIN-FILMS, CU2-XSYSE1-Y NANOCRYSTALS, SULFIDE NANOCRYSTALS, TUNABLE COMPOSITIONS, VACANCY FORMATION, CONDUCTIVITY

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MLA
Maiti, Sonam et al. “Dye-sensitized Ternary Copper Chalcogenide Nanocrystals : Optoelectronic Properties, Air Stability, and Photosensitivity.” CHEMISTRY OF MATERIALS 31.7 (2019): 2443–2449. Print.
APA
Maiti, S., Maiti, S., Khan, A., Wolf, A., Dorfs, D., Moreels, I., Schreiber, F., et al. (2019). Dye-sensitized ternary copper chalcogenide nanocrystals : optoelectronic properties, air stability, and photosensitivity. CHEMISTRY OF MATERIALS, 31(7), 2443–2449.
Chicago author-date
Maiti, Sonam, Santanu Maiti, Ali Khan, Andreas Wolf, Dirk Dorfs, Iwan Moreels, Frank Schreiber, and Marcus Scheele. 2019. “Dye-sensitized Ternary Copper Chalcogenide Nanocrystals : Optoelectronic Properties, Air Stability, and Photosensitivity.” Chemistry of Materials 31 (7): 2443–2449.
Chicago author-date (all authors)
Maiti, Sonam, Santanu Maiti, Ali Khan, Andreas Wolf, Dirk Dorfs, Iwan Moreels, Frank Schreiber, and Marcus Scheele. 2019. “Dye-sensitized Ternary Copper Chalcogenide Nanocrystals : Optoelectronic Properties, Air Stability, and Photosensitivity.” Chemistry of Materials 31 (7): 2443–2449.
Vancouver
1.
Maiti S, Maiti S, Khan A, Wolf A, Dorfs D, Moreels I, et al. Dye-sensitized ternary copper chalcogenide nanocrystals : optoelectronic properties, air stability, and photosensitivity. CHEMISTRY OF MATERIALS. 2019;31(7):2443–9.
IEEE
[1]
S. Maiti et al., “Dye-sensitized ternary copper chalcogenide nanocrystals : optoelectronic properties, air stability, and photosensitivity,” CHEMISTRY OF MATERIALS, vol. 31, no. 7, pp. 2443–2449, 2019.
@article{8625788,
  abstract     = {We report on the effect of ligand exchange of Cu2SeyS1-y and Cu2Se nanocrystals (NCs) with the organic pi system cobalt beta-tetraaminophthalocyanine (CoTAPc) and analyze the changes in the structural, optical, and electric properties of thin films of these hybrid materials. A strong ligand interaction with the surface of the NCs is revealed by UV/vis absorption and Raman spectroscopy. Grazing incidence small-angle X-ray scattering studies show a significant contraction in the interparticle distance upon ligand exchange. For copper-deficient Cu2-xSe, this contraction has a negligible effect on electric transport, whereas for copper-deficient Cu2-xSeyS1-y, the conductivity increases by 8 orders of magnitude and results in metal-like temperature-dependent transport. We discuss these differences in the light of varying contributions of electronic vs ionic transport in the two materials and highlight their effect on the stability of the transport properties under ambient conditions. With photocurrent measurements, we demonstrate high optical responsivities of 200-400 A W-1 for CoTAPc-capped Cu2SeyS1-y and emphasize the beneficial role of the organic pi-system in this respect, which acts as an electronic linker and an optical sensitizer at the same time.},
  author       = {Maiti, Sonam and Maiti, Santanu and Khan, Ali and Wolf, Andreas and Dorfs, Dirk and Moreels, Iwan and Schreiber, Frank and Scheele, Marcus},
  issn         = {0897-4756},
  journal      = {CHEMISTRY OF MATERIALS},
  keywords     = {SURFACE-PLASMON RESONANCE,CONTROLLABLE SYNTHESIS,CU2-XSE NANOCRYSTALS,CATION-EXCHANGE,THIN-FILMS,CU2-XSYSE1-Y NANOCRYSTALS,SULFIDE NANOCRYSTALS,TUNABLE COMPOSITIONS,VACANCY FORMATION,CONDUCTIVITY},
  language     = {eng},
  number       = {7},
  pages        = {2443--2449},
  title        = {Dye-sensitized ternary copper chalcogenide nanocrystals : optoelectronic properties, air stability, and photosensitivity},
  url          = {http://dx.doi.org/10.1021/acs.chemmater.8b05108},
  volume       = {31},
  year         = {2019},
}
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