Germanane is a two-dimensional, strongly confined form of germanium. It presents an interesting combination of (i) ease of integration with CMOS technology, (ii) low toxicity, and (iii) electronic confinement which transforms the indirect bandgap of the bulk material into a direct bandgap featuring photoluminescence. However, the optoelectronic properties of this material remain far less investigated than its structural properties. Here, we investigate the photoluminescence and transport properties of arrays of methyl-terminated germanane flakes. The photoluminescence appears to have two contributions, one from the band edge and the other from trap states. The dynamics of the exciton appear to be in the range of 1–100 ns. Conduction in this material appears to be p-type, while the photoconduction time response can be made as short as 100 μs.
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29 July 2019
Research Article|
August 01 2019
Optoelectronic properties of methyl-terminated germanane
Clément Livache
;
Clément Livache
1
Sorbonne Université, CNRS, Institut des NanoSciences de Paris
, 4 place Jussieu, 75005 Paris, France
2
Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université Univ Paris 06, CNRS UMR 8213
, 10 rue Vauquelin, 75005 Paris, France
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Bradley J. Ryan;
Bradley J. Ryan
3
Department of Chemical and Biological Engineering, Iowa State University
, Ames, Iowa 50011, USA
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Utkarsh Ramesh;
Utkarsh Ramesh
3
Department of Chemical and Biological Engineering, Iowa State University
, Ames, Iowa 50011, USA
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Violette Steinmetz
;
Violette Steinmetz
1
Sorbonne Université, CNRS, Institut des NanoSciences de Paris
, 4 place Jussieu, 75005 Paris, France
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Charlie Gréboval
;
Charlie Gréboval
1
Sorbonne Université, CNRS, Institut des NanoSciences de Paris
, 4 place Jussieu, 75005 Paris, France
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Audrey Chu
;
Audrey Chu
1
Sorbonne Université, CNRS, Institut des NanoSciences de Paris
, 4 place Jussieu, 75005 Paris, France
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Thibault Brule;
Thibault Brule
4
HORIBA Scientific, HORIBA France S.A.S.
, Avenue de la Vauve, Passage Jobin Yvon, 91120 Palaiseau, France
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Sandrine Ithurria
;
Sandrine Ithurria
2
Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université Univ Paris 06, CNRS UMR 8213
, 10 rue Vauquelin, 75005 Paris, France
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Geoffroy Prévot;
Geoffroy Prévot
1
Sorbonne Université, CNRS, Institut des NanoSciences de Paris
, 4 place Jussieu, 75005 Paris, France
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Thierry Barisien
;
Thierry Barisien
1
Sorbonne Université, CNRS, Institut des NanoSciences de Paris
, 4 place Jussieu, 75005 Paris, France
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Abdelkarim Ouerghi
;
Abdelkarim Ouerghi
5
Centre de Nanosciences et de Nanotechnologies, CNRS, University of Paris-Sud
, Universite Paris-Saclay, C2N, Palaiseau 91460, France
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Matthew G. Panthani
;
Matthew G. Panthani
3
Department of Chemical and Biological Engineering, Iowa State University
, Ames, Iowa 50011, USA
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Emmanuel Lhuillier
Emmanuel Lhuillier
a)
1
Sorbonne Université, CNRS, Institut des NanoSciences de Paris
, 4 place Jussieu, 75005 Paris, France
a)Author to whom correspondence should be addressed: el@insp.upmc.fr
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a)Author to whom correspondence should be addressed: el@insp.upmc.fr
Appl. Phys. Lett. 115, 052106 (2019)
Article history
Received:
May 22 2019
Accepted:
July 08 2019
Citation
Clément Livache, Bradley J. Ryan, Utkarsh Ramesh, Violette Steinmetz, Charlie Gréboval, Audrey Chu, Thibault Brule, Sandrine Ithurria, Geoffroy Prévot, Thierry Barisien, Abdelkarim Ouerghi, Matthew G. Panthani, Emmanuel Lhuillier; Optoelectronic properties of methyl-terminated germanane. Appl. Phys. Lett. 29 July 2019; 115 (5): 052106. https://doi.org/10.1063/1.5111011
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