Details
| Original language | English |
|---|---|
| Pages (from-to) | 2443-2449 |
| Number of pages | 7 |
| Journal | Chemistry of materials |
| Volume | 31 |
| Issue number | 7 |
| Early online date | 11 Mar 2019 |
| Publication status | Published - 9 Apr 2019 |
Abstract
We report on the effect of ligand exchange of Cu2SeyS1-y and Cu2Se nanocrystals (NCs) with the organic Ï€-system cobalt β-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 π-system in this respect, which acts as an electronic linker and an optical sensitizer at the same time.
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Chemical Engineering(all)
- General Chemical Engineering
- Materials Science(all)
- Materials Chemistry
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In: Chemistry of materials, Vol. 31, No. 7, 09.04.2019, p. 2443-2449.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Dye-Sensitized Ternary Copper Chalcogenide Nanocrystals
T2 - Optoelectronic Properties, Air Stability, and Photosensitivity
AU - Maiti, Sonam
AU - Maiti, Santanu
AU - Khan, Ali Hossain
AU - Wolf, Andreas
AU - Dorfs, Dirk
AU - Moreels, Iwan
AU - Schreiber, Frank
AU - Scheele, Marcus
N1 - Funding information: The authors acknowledge the DFG for support under Grants SCHE1905/3, DO1580/5, and SCHR700/25. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No. 802822). We also thank Elke Nadler, Institute of Physical and Theoretical Chemistry, University of Tübingen, for performing SEM/ STEM measurements using a Hitachi SU 8030 SEM which was funded by the DFG under contract INST 37/829-1 FUGG, partially. The authors acknowledge the DFG for support under Grants SCHE1905/3 DO1580/5, and SCHR700/25. This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement No. 802822). We also thank Elke Nadler, Institute of Physical and Theoretical Chemistry, University of TuÌbingen, for performing SEM/STEM measurements using a Hitachi SU 8030 SEM which was funded by the DFG under contract INST 37/829-1 FUGG, partially.
PY - 2019/4/9
Y1 - 2019/4/9
N2 - We report on the effect of ligand exchange of Cu2SeyS1-y and Cu2Se nanocrystals (NCs) with the organic Ï€-system cobalt β-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 π-system in this respect, which acts as an electronic linker and an optical sensitizer at the same time.
AB - We report on the effect of ligand exchange of Cu2SeyS1-y and Cu2Se nanocrystals (NCs) with the organic Ï€-system cobalt β-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 π-system in this respect, which acts as an electronic linker and an optical sensitizer at the same time.
UR - http://www.scopus.com/inward/record.url?scp=85064223145&partnerID=8YFLogxK
U2 - 10.48550/arXiv.1903.05037
DO - 10.48550/arXiv.1903.05037
M3 - Article
AN - SCOPUS:85064223145
VL - 31
SP - 2443
EP - 2449
JO - Chemistry of materials
JF - Chemistry of materials
SN - 0897-4756
IS - 7
ER -