Energy levels of double triangular graphene quantum dots

2014 ◽  
Vol 116 (12) ◽  
pp. 123706 ◽  
Author(s):  
F. X. Liang ◽  
Z. T. Jiang ◽  
Z. T. Lv ◽  
H. Y. Zhang ◽  
S. Li
Keyword(s):  
Quantum Dots ◽  
Energy Levels ◽  
Graphene Quantum Dots

scholarly journals Energy levels of hybrid monolayer-bilayer graphene quantum dots

2016 ◽  
Vol 93 (16) ◽  
Author(s):  
M. Mirzakhani ◽  
M. Zarenia ◽  
S. A. Ketabi ◽  
D. R. da Costa ◽  
F. M. Peeters
Keyword(s):  
Quantum Dots ◽  
Energy Levels ◽  
Graphene Quantum Dots ◽  
Bilayer Graphene

scholarly journals Magnetic field dependence of energy levels in biased bilayer graphene quantum dots

2016 ◽  
Vol 93 (8) ◽  
Author(s):  
D. R. da Costa ◽  
M. Zarenia ◽  
Andrey Chaves ◽  
G. A. Farias ◽  
F. M. Peeters
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Field Dependence ◽  
Magnetic Field Dependence ◽  
Energy Levels ◽  
Graphene Quantum Dots ◽  
Bilayer Graphene

scholarly journals A Facile Microwave-Assisted Hydrothermal Synthesis of Graphene Quantum Dots for Organic Solar Cell Efficiency Improvement

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Thi Thu Hoang ◽  
Hoai Phuong Pham ◽  
Quang Trung Tran
Keyword(s):  
Quantum Dots ◽  
Organic Solar Cells ◽  
Energy Levels ◽  
Graphene Quantum Dots ◽  
Blue Emission ◽  
Spectroscopic Characterization ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Microwave Assisted

Carbon-based nanomaterials have successively remained at the forefront of different research fields and applications for years. Understanding of low-dimension carbon material family (CNT, fullerenes, graphene, and graphene quantum dots) has arrived at a certain extension. In this report, graphene quantum dots were synthesized from graphene oxide with a microwave-assisted hydrothermal method. Compared with conventional time-consuming hydrothermal routes, this novel method requires a much shorter time, around ten minutes. Successful formation of quantum dots derived from graphene sheets was verified with microscopic and spectroscopic characterization. Nanoparticles present a diameter of about 2-8 nm, blue emission under ultraviolet excitation, and good dispersion in polar solvents and can be collected in powder form. The synthesized graphene quantum dots were utilized as a hole transport layer in organic solar cells to enhance the cell quantum efficiency. Such quantum dots possess energy levels (Ec and Ev) relevant to HOMO and LUMO levels of conductive polymers. Mixing P3HT:PCBM polymer and graphene quantum dots of sufficient extent notably helps reduce potential difference at interfaces of the two materials. Overall efficiency consequently advances to 1.43%, an increase of more than 44% compared with pristine cells (0.99%).

Analytical study of the energy levels in bilayer graphene quantum dots

Carbon ◽  
2014 ◽  
Vol 78 ◽  
pp. 392-400 ◽  
Author(s):  
D.R. da Costa ◽  
M. Zarenia ◽  
Andrey Chaves ◽  
G.A. Farias ◽  
F.M. Peeters
Keyword(s):  
Quantum Dots ◽  
Analytical Study ◽  
Energy Levels ◽  
Graphene Quantum Dots ◽  
Bilayer Graphene
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