Photoinduced conductivity enhancement in quantum dot/multilayer graphene nanostructures

2015 ◽  
Vol 1787 ◽  
pp. 15-19 ◽  
Author(s):  
Yulia A. Gromova ◽  
Ivan A. Reznik ◽  
Ilia A. Vovk ◽  
Simas Rackauskas ◽  
Andrei V. Alaferdov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Quantum Dots ◽  
Energy Level ◽  
Quantum Dot ◽  
Level Structure ◽  
Hybrid Structures ◽  
Multilayer Graphene ◽  
Energy Level Structure ◽  
Conductivity Enhancement ◽  
Mild Conditions

ABSTRACTWe report on the formation of photoactive hybrid structures based on multilayer graphene nanobelts and CdSe/ZnS quantum dots (QDs) on Pt microelectrodes. We have found that heat treatment in mild conditions enhances rate of electrical photoresponse of the hybrid structures due to elimination of long-lived charge traps. We also show that the electrical photoresponse polarity depends on the energy level structure of the QDs.

Energy-level structure of nitrogen-doped graphene quantum dots

2013 ◽  
Vol 1 (32) ◽  
pp. 4908 ◽  
Author(s):  
Libin Tang ◽  
Rongbin Ji ◽  
Xueming Li ◽  
Kar Seng Teng ◽  
Shu Ping Lau
Keyword(s):  
Quantum Dots ◽  
Energy Level ◽  
Level Structure ◽  
Graphene Quantum Dots ◽  
Energy Level Structure ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

scholarly journals Light management with quantum nanostructured dots-in-host semiconductors

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
M. Alexandre ◽  
H. Águas ◽  
E. Fortunato ◽  
R. Martins ◽  
M. J. Mendes
Keyword(s):  
Quantum Dots ◽  
Energy Level ◽  
Effective Mass ◽  
Potential Barrier ◽  
Level Structure ◽  
Colloidal Quantum Dots ◽  
Absorption Coefficients ◽  
Energy Level Structure ◽  
Bulk Semiconductors ◽  
Light Management

AbstractInsightful knowledge on quantum nanostructured materials is paramount to engineer and exploit their vast gamut of applications. Here, a formalism based on the single-band effective mass equation was developed to determine the light absorption of colloidal quantum dots (CQDs) embedded in a wider bandgap semiconductor host, employing only three parameters (dots/host potential barrier, effective mass, and QD size). It was ascertained how to tune such parameters to design the energy level structure and consequent optical response. Our findings show that the CQD size has the biggest effect on the number and energy of the confined levels, while the potential barrier causes a linear shift of their values. While smaller QDs allow wider energetic separation between levels (as desired for most quantum-based technologies), the larger dots with higher number of levels are those that exhibit the strongest absorption. Nevertheless, it was unprecedently shown that such quantum-enabled absorption coefficients can reach the levels (104–105 cm−1) of bulk semiconductors.

scholarly journals Optical Control of Energy-Level Structure of Few Electrons in AlGaAs/GaAs Quantum Dots

Nano Letters ◽  
2008 ◽  
Vol 8 (2) ◽  
pp. 577-581 ◽  
Author(s):  
Sokratis Kalliakos ◽  
Vittorio Pellegrini ◽  
Cesar Pascual Garcia ◽  
Aron Pinczuk ◽  
Loren N. Pfeiffer ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Level ◽  
Level Structure ◽  
Optical Control ◽  
Energy Level Structure

Photoreflectance study of energy level structure of self-assembled InAs/GaAs quantum dots emitting at 1.3μm

2005 ◽  
Vol 135 (4) ◽  
pp. 232-236 ◽  
Author(s):  
W. Rudno-Rudziński ◽  
K. Ryczko ◽  
G. Sęk ◽  
J. Misiewicz ◽  
M.J. da Silva ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Level ◽  
Level Structure ◽  
Energy Level Structure ◽  
Self Assembled

Energy level structure and electron relaxation times in InAs∕InxGa1−xAs quantum dot-in-a-well structures

2007 ◽  
Vol 91 (25) ◽  
pp. 253502 ◽  
Author(s):  
P. Aivaliotis ◽  
S. Menzel ◽  
E. A. Zibik ◽  
J. W. Cockburn ◽  
L. R. Wilson ◽  
...  
Keyword(s):  
Energy Level ◽  
Quantum Dot ◽  
Level Structure ◽  
Relaxation Times ◽  
Energy Level Structure ◽  
Electron Relaxation

Energy level structure of Sc42

1965 ◽  
Vol 62 (3) ◽  
pp. 434-448 ◽  
Author(s):  
J.W. Nelson ◽  
J.D. Oberholtzer ◽  
H.S. Plendl
Keyword(s):  
Energy Level ◽  
Level Structure ◽  
Energy Level Structure
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