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Graphene–Organic Two-Dimensional Charge-Transfer Complexes: Intermolecular Electronic Transitions and Broadband Near-Infrared Photoresponse
Menghua Cui,
Yuzheng Guo 
,
Yiming Zhu,
Haining Liu,
Wen Wen,
Juanxia Wu,
Linxiu Cheng,
Qingdao Zeng,
Liming Xie
,
Yiming Zhu,
Haining Liu,
Wen Wen,
Juanxia Wu,
Linxiu Cheng,
Qingdao Zeng,
Liming Xie
The Journal of Physical Chemistry C, Volume: 122, Issue: 13, Pages: 7551 - 7556
Swansea University Author:
Yuzheng Guo
-
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DOI (Published version): 10.1021/acs.jpcc.8b01408
Abstract
Charge-transfer (CT) complexes with unique intermolecular electronic transitions have attracted broad interest and hold great potential in optoelectronic applications. Here, we report a new family of two-dimensional graphene-organic molecule CT complexes. Density functional theory (DFT) calculation...
| Published in: | The Journal of Physical Chemistry C |
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| ISSN: | 1932-7447 1932-7455 |
| Published: |
2018
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa39464 |
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| Abstract: |
Charge-transfer (CT) complexes with unique intermolecular electronic transitions have attracted broad interest and hold great potential in optoelectronic applications. Here, we report a new family of two-dimensional graphene-organic molecule CT complexes. Density functional theory (DFT) calculation has revealed low-energy CT bands in the near-infrared (NIR) region up to 2000 nm for graphene-TCNQ (tetracyanoquinodimethane), graphene-F4TCNQ (2,3,5,6-Tetrafluoro-tetracyanoquinodimethane) and graphene-TCOQ (tetrachloro-o-benzoquinone) complexes. Raman and electrical measurements have confirmed a partial charge transfer between graphene and the molecules at the ground state. CT excitations have been calculated by DFT and verified by optoelectronic measurements. The graphene–organic CT complexes have shown a broadband photoresponse from the visible to NIR range, attributed to the intermolecular electronic transitions. Further, the photoresponsivity (up to 103 A/W) suggests a high photoelectrical gain arising from the photogating effect at the graphene/molecule interface. At last, the photoresponse property of the graphene–organic CT complexes can be tuned by electrical gating of graphene. |
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| College: |
Faculty of Science and Engineering |
| Issue: |
13 |
| Start Page: |
7551 |
| End Page: |
7556 |