Creation of light-emitting structures based on CdSe nanoplatelets

Август 23, 2022

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Creation of light-emitting structures based on CdSe nanoplatelets

Содержание

2. Introduction Light-emitting structures based on CdSe nanoplatelets International Students and Scholars Rock 2k Advantages of CdSe
3. International Students and Scholars Rock Purpose of research 3k Development and experimental investigation of resonant nanostructures
4. International Students and Scholars Rock PLAN for 2021-2025 4k Refinement of solution-based fabrication methods for creation
5. Results: Work plan 5k
6. International Students and Scholars Rock 1) Calculation of TiO2 layer thickness Estimated layer thicknesses: 6k
7. International Students and Scholars Rock 2) Synthesis of ini CdSe NPL solutions Two groups of solutions
8. International Students and Scholars Rock Progress 3) Spin-coating on Silicon substrate 7) Applying TiO2 layer to
9. International Students and Scholars Rock 4) AFM measurements: UNAM From Hexane: 9k
10. International Students and Scholars Rock UNAM From Toluene: 10k 4) AFM measurements:
11. International Students and Scholars Rock 6) Ellipsometry of CdSe layer on Silicon substrate 11k
12. International Students and Scholars Rock 5) Applying TiO2 layer to substrates UNAM ALD goes wrong: 1.
13. International Students and Scholars Rock 6) Ellipsometry of TiO2 layer on Silcon substrate 1. 3. 13k
14. International Students and Scholars Rock 7-8) Self-Assembling on Quartz substrate UNAM From Hexane AFM measurements: 14k
15. Today… 9) CdSe NPL films on modified substrate Self-Assembling: Spin-coating: 15k
17. Скачать презентацию

Слайд 2

Introduction
Light-emitting structures based on CdSe nanoplatelets
International Students and Scholars Rock
2k
Advantages of

CdSe nanoparticles:
1) Narrow photoluminescence band
2) Short photoluminescence lifetime
3) Low Auger recombination rate
Disadvantages of CdSe nanoparticles :
1) High photochemical degradation rate
2) Large number of nonradiative energy relaxation channels

Articles, underlying proposed approach:

Слайд 3

International Students and Scholars Rock
Purpose of research
3k
Development and experimental investigation of

resonant nanostructures based on CdSe nanoplatelets for low-threshold laser generation
(full research cycle including numerical modelling, fabrication and post-processing of CdSe NPL films, and measurement of emission characteristics)

Слайд 4

International Students and Scholars Rock
PLAN for 2021-2025
4k
Refinement of solution-based fabrication methods

for creation of CdSe NPL films
Spin coating
Self-assembly
Development of designs of optical resonators (metasurfaces) for CdSe photoluminescence enhancement and lasing
Fourier modal method calculations
Full wave numerical modelling
Fabrication of optical resonators from CdSe films
Laser ablation / force lithography / focused ion beam milling / …
Experimental studies of the fabricated structures
Photoluminescence -> Amplified spontaneous emission -> Lasing with optical pump
Exploring the possibility of electrically pumped lasing in CdSe nanostructures
Designing the carrier injection layers -> numerical modelling -> fabrication -> testing -> repeat

Слайд 5

Results: Work plan
5k

Слайд 6

International Students and Scholars Rock
1) Calculation of TiO2 layer thickness
Estimated layer

thicknesses:

Слайд 7

International Students and Scholars Rock
2) Synthesis of ini CdSe NPL solutions
Two

groups of solutions were prepared:
1) Centrifugation of the ini solution, and then redissolution of the precipitate in hexane
2) Centrifugation of the supernatant and then redissolution in hexane or toluene

Слайд 8

International Students and Scholars Rock
Progress
3) Spin-coating on Silicon substrate
7) Applying TiO2
layer

to substrate

5) Self-Assembling on Quartz substrate

Слайд 9

International Students and Scholars Rock
4) AFM measurements:
UNAM
From Hexane:
9k

Слайд 10

International Students and Scholars Rock
UNAM
From Toluene:
10k
4) AFM measurements:

Слайд 11

International Students and Scholars Rock
6) Ellipsometry of CdSe layer on Silicon

substrate

11k

Слайд 12

International Students and Scholars Rock
5) Applying TiO2 layer to substrates
UNAM
ALD goes

wrong:

12k

EDX

23 nm

27 nm

Слайд 13

International Students and Scholars Rock
6) Ellipsometry of TiO2 layer on Silcon

substrate

13k

Слайд 14

International Students and Scholars Rock
7-8) Self-Assembling on Quartz substrate
UNAM
From Hexane
AFM measurements:
14k

Слайд 15

Creation of light-emitting structures based on CdSe nanoplatelets

Содержание

IntroductionLight-emitting structures based on CdSe nanoplateletsInternational Students and Scholars Rock2kAdvantages of

International Students and Scholars RockPurpose of research3kDevelopment and experimental investigation of

International Students and Scholars RockPLAN for 2021-20254kRefinement of solution-based fabrication methods

Results: Work plan5k

International Students and Scholars Rock1) Calculation of TiO2 layer thicknessEstimated layer

International Students and Scholars Rock2) Synthesis of ini CdSe NPL solutionsTwo

International Students and Scholars RockProgress3) Spin-coating on Silicon substrate7) Applying TiO2 layer

International Students and Scholars Rock4) AFM measurements:UNAMFrom Hexane:9k

International Students and Scholars RockUNAMFrom Toluene:10k4) AFM measurements:

International Students and Scholars Rock6) Ellipsometry of CdSe layer on Silicon

International Students and Scholars Rock5) Applying TiO2 layer to substratesUNAMALD goes

International Students and Scholars Rock6) Ellipsometry of TiO2 layer on Silcon

International Students and Scholars Rock7-8) Self-Assembling on Quartz substrateUNAMFrom HexaneAFM measurements:14k

Today…9) CdSe NPL films on modified substrateSelf-Assembling:Spin-coating:15k

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