Submonolayer Quantum Dots in P-i-P configuration: Study on effects of monolayer coverage and stacking variations

2020 ◽  
Author(s):  
Suryansh Dongre ◽  
Debi Prasad Panda ◽  
Sanowar Alam Gazi ◽  
Debabrata Das ◽  
Ravinder Kumar ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Monolayer Coverage

Tuning of near infrared excitonic emission from InAs quantum dots by controlling the sub-monolayer coverage

2019 ◽  
Vol 210 ◽  
pp. 311-321 ◽  
Author(s):  
S. Mukherjee ◽  
A. Pradhan ◽  
S. Mukherjee ◽  
T. Maitra ◽  
S. Sengupta ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Near Infrared ◽  
Inas Quantum Dots ◽  
Excitonic Emission ◽  
Monolayer Coverage

Comparison of single-layer and bilayer InAs/GaAs quantum dots with a higher InAs coverage

2010 ◽  
Vol 18 (3) ◽  
Author(s):  
S. Sengupta ◽  
S.Y. Shah ◽  
N. Halder ◽  
S. Chakrabarti
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Emission Line ◽  
Size Distribution ◽  
Single Layer ◽  
Quantum Dot Lasers ◽  
Narrow Linewidth ◽  
Inas Quantum Dots ◽  
Monolayer Coverage ◽  
Narrow Emission

AbstractEpitaxially grown self-assembled InAs quantum dots (QDs) have found applications in optoelectronics. Efforts are being made to obtain efficient quantum-dot lasers operating at longer telecommunication wavelengths, specifically 1.3 μm and 1.55 μm. This requires narrow emission linewidth from the quantum dots at these wavelengths. In InAs/GaAs single layer quantum dot (SQD) structure, higher InAs monolayer coverage for the QDs gives rise to larger dots emitting at longer wavelengths but results in inhomogeneous dot-size distribution. The bilayer quantum dot (BQD) can be used as an alternative to SQDs, which can emit at longer wavelengths (1.229 μm at 8 K) with significantly narrow linewidth (∼16.7 meV). Here, we compare the properties of single layer and bilayer quantum dots grown with higher InAs monolayer coverage. In the BQD structure, only the top QD layer is covered with increased (3.2 ML) InAs monolayer coverage. The emission line width of our BQD sample is found to be insensitive towards post growth treatments.

Photoluminescence Investigation of the Effects of Barrier Thickness and Monolayer Coverage on Properties of Bilayer InAs/GaAs Quantum Dots

2008 ◽  
Vol 3 (3) ◽  
pp. 277-280 ◽  
Author(s):  
S. Chakrabarti ◽  
N. Halder ◽  
S. Sengupta ◽  
Jayant Charthad ◽  
Sandip Ghosh ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Barrier Thickness ◽  
Monolayer Coverage

Nanostructure of semiconductor quantum dots in a borosilicate glass matrix by complementary use of HREM and AEM

1990 ◽  
Vol 48 (4) ◽  
pp. 728-729
Author(s):  
M.J. Kim ◽  
L.C. Liu ◽  
S.H. Risbud ◽  
R.W. Carpenter
Keyword(s):  
Quantum Dots ◽  
Borosilicate Glass ◽  
Glass Matrix ◽  
Optical Switching ◽  
Response Times ◽  
Fast Response ◽  
Processing Technique ◽  
Internal Stresses ◽  
Electron Hole ◽  
Spatial Dimensions

When the size of a semiconductor is reduced by an appropriate materials processing technique to a dimension less than about twice the radius of an exciton in the bulk crystal, the band like structure of the semiconductor gives way to discrete molecular orbital electronic states. Clusters of semiconductors in a size regime lower than 2R {where R is the exciton Bohr radius; e.g. 3 nm for CdS and 7.3 nm for CdTe) are called Quantum Dots (QD) because they confine optically excited electron- hole pairs (excitons) in all three spatial dimensions. Structures based on QD are of great interest because of fast response times and non-linearity in optical switching applications.In this paper we report the first HREM analysis of the size and structure of CdTe and CdS QD formed by precipitation from a modified borosilicate glass matrix. The glass melts were quenched by pouring on brass plates, and then annealed to relieve internal stresses. QD precipitate particles were formed during subsequent "striking" heat treatments above the glass crystallization temperature, which was determined by differential thermal analysis.

Attenuation of surface acoustic waves by quantum dots

1998 ◽  
Vol 77 (5) ◽  
pp. 1195-1202
Author(s):  
Andreas Knabchen Yehoshua, B. Levinson, Ora
Keyword(s):  
Quantum Dots ◽  
Acoustic Waves ◽  
Surface Acoustic Waves
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