scholarly journals Optical Properties of Site-Selectively Grown InAs/InP Quantum Dots with Predefined Positioning by Block Copolymer Lithography

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 391
Author(s):  
Paweł Holewa ◽  
Jakub Jasiński ◽  
Artem Shikin ◽  
Elizaveta Lebedkina ◽  
Aleksander Maryński ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Block Copolymer ◽  
Theoretical Calculations ◽  
Droplet Epitaxy ◽  
Time Resolved ◽  
Carrier Capture ◽  
Decay Times ◽  
Block Copolymer Lithography ◽  
Inp Quantum Dots ◽  
Copolymer Lithography

The InAs/InP quantum dots (QDs) are investigated by time-integrated (PL) and time-resolved photoluminescence (TRPL) experiments. The QDs are fabricated site-selectively by droplet epitaxy technique using block copolymer lithography. The estimated QDs surface density is ∼1.5 × 1010 cm−2. The PL emission at T=300 K is centered at 1.5 μm. Below T=250 K, the PL spectrum shows a fine structure consisting of emission modes attributed to the multimodal QDs size distribution. Temperature-dependent PL reveals negligible carrier transfer among QDs, suggesting good carrier confinement confirmed by theoretical calculations and the TRPL experiment. The PL intensity quench and related energies imply the presence of carrier losses among InP barrier states before carrier capture by QD states. The TRPL experiment highlighted the role of the carrier reservoir in InP. The elongation of PL rise time with temperature imply inefficient carrier capture from the reservoir to QDs. The TRPL experiment at T=15 K reveals the existence of two PL decay components with strong dispersion across the emission spectrum. The decay times dispersion is attributed to different electron-hole confinement regimes for the studied QDs within their broad distribution affected by the size and chemical content inhomogeneities.

Block copolymer self-assembly assisted fabrication of laterally organized- and stacked- nanoarrays

2021 ◽  
Author(s):  
Vignesh Suresh ◽  
Ah Bian Chew ◽  
Christina Yuan Ling Tan ◽  
Hui Ru Tan
Keyword(s):  
Block Copolymer ◽  
Self Assembly ◽  
The Self ◽  
Functional Surfaces ◽  
Self Assembled ◽  
Block Copolymer Lithography ◽  
Unique Surface ◽  
Copolymer Lithography

Abstract Block copolymer (BCP) self-assembly processes are often seen as reliable techniques for advanced nanopatterning to achieve functional surfaces and create templates for nanofabrication. By taking advantage of the tunability in pitch, diameter and feature-to-feature separation of the self-assembled BCP features, complex, laterally organized- and stacked- multicomponent nanoarrays comprising of gold and polymer have been fabricated. The approaches not only demonstrate nanopatterning of up to two levels of hierarchy but also investigate how a variation in the feature-to-feature gap at the first hierarchy affects the self-assembly of polymer features at the second. Such BCP self-assembly enabled multicomponent nanoarray configurations are rarely achieved by other nanofabrication approaches and are particularly promising for pushing the boundaries of block copolymer lithography and in creating unique surface architectures and complex morphologies at the nanoscale.

Time-resolved luminescence study of InP quantum dots in GaInP matrix

1998 ◽  
Vol 42 (7-8) ◽  
pp. 1319-1323 ◽  
Author(s):  
Tsuyoshi Okuno ◽  
Hong-Wen Ren ◽  
Mitsuru Sugisaki ◽  
Kenichi Nishi ◽  
Shigeo Sugou ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Time Resolved ◽  
Luminescence Study ◽  
Inp Quantum Dots
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