A5017446999- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Photonic and Optical Devices
- ZnO doping and properties
- Photonic Crystals and Applications
- Semiconductor Lasers and Optical Devices
- Perovskite Materials and Applications
- GaN-based semiconductor devices and materials
- Semiconductor materials and devices
- Electrowetting and Microfluidic Technologies
- Microfluidic and Capillary Electrophoresis Applications
- Additive Manufacturing and 3D Printing Technologies
- Advanced Memory and Neural Computing
- Laser-Ablation Synthesis of Nanoparticles
- Photocathodes and Microchannel Plates
- Nanowire Synthesis and Applications
- Algal biology and biofuel production
- Ga2O3 and related materials
- Gold and Silver Nanoparticles Synthesis and Applications
- Optical Coatings and Gratings
- Near-Field Optical Microscopy
- Copper-based nanomaterials and applications
TRUMPF (Germany)
2024
Bilkent University
2017-2021
Istanbul Technical University
2016-2020
We propose and demonstrate construction of highly uniform, multilayered superstructures CdSe/CdZnS core/shell colloidal nanoplatelets (NPLs) using liquid interface self-assembly. These NPLs are sequentially deposited onto a solid substrate into slabs having monolayer-precise thickness across tens cm2 areas. Because near-unity surface coverage excellent uniformity, amplified spontaneous emission (ASE) is observed from an uncharacteristically thin film 6 NPL layers, corresponding to mere 42 nm...
Recently, there has been tremendous interest in the synthesis and optoelectronic applications of quasi-two-dimensional colloidal nanoplatelets (NPLs). Thanks to ultranarrow emission linewidth, high-extinction coefficient, high photostability, NPLs offer an exciting opportunity for high-performance optoelectronics. However, until now, these are limited available discrete ranges, limiting full potential exotic materials as efficient light emitters. Here, we introduce a detailed systematic...
Abstract The realization of high‐quality lasers in microfluidic devices is crucial for numerous applications, including biological and chemical sensors flow cytometry, the development advanced lab‐on‐chip (LOC) devices. Herein, an ultralow‐threshold single‐mode laser proposed demonstrated using on‐chip cavity. CdSe/CdS@Cd x Zn 1− S core/crown@gradient‐alloyed shell colloidal semiconductor quantum wells (CQWs) dispersed toluene are employed cavity created inside a poly(dimethylsiloxane)...
Extending the emission peak wavelength of quasi-2D colloidal quantum wells has been an important quest to fully exploit potential these materials, which not possible due complications arising from partial dissolution and recrystallization during growth date. Here, synthetic pathway (CdSe/CdS)@(1-4 CdS/CdZnS) (core/crown)@(colloidal atomic layer deposition shell/hot injection shell) hetero-nanoplatelets (NPLs) using multiple techniques, together enable highly efficient beyond 700 nm in...
Here, the first account of self-resonant fully-colloidal u-lasers made from colloidal quantum well (CQW) solution is reported. A deep patterning technique developed to fabricate well-defined high aspect-ratio on-chip CQW resonators grating waveguides and in-plane reflectors. CQWs patterned layers are closed-packed with sharp edges residual-free lifted-off surfaces. Additionally, method successfully applied various nanoparticles including dots metal nanoparticles. It observed that process...
Silicon is the most prevalent material system for light-harvesting applications; however, its inherent indirect bandgap and consequent weak absorption limits potential in optoelectronics. This paper proposes to address this limitation by combining sensitization of silicon with extraordinarily large cross sections quasi-2D colloidal quantum well nanoplatelets (NPLs) demonstrate excitation transfer from these NPLs bulk silicon. Here, distance dependency, d, resulting Förster resonant energy...
This study demonstrates an ultra-thin colloidal gain medium consisting of bi-layers quantum wells (CQWs) with a total film thickness 14 nm integrated high-index dielectrics. To achieve optical from such nanocrystal film, hybrid waveguide structures partly composed self-assembled layers CQWs and dielectric material are developed shown: in asymmetric architecture employing one thin underneath the case quasi-symmetric pair films sandwiching CQWs. Numerical modeling indicates that modal...
Abstract In this work, monolithically‐fabricated vertical cavity surface emitting lasers (VCSELs) of densely‐packed, orientation‐controlled, atomically flat colloidal quantum wells (CQWs) using a self‐assembly method is reported and single‐mode lasing from record thin gain medium with film thickness 7 nm under femtosecond optical excitation demonstrated. Specially engineered CQWs are used to demonstrate these hybrid CQW‐VCSELs consisting only few layers single monolayer achieved the media by...
We present a comparative experimental and theoretical study on the determination of capped core diameter in ZnSe/ZnS, CdSe/Cd(Zn)S type-I ZnSe/CdS type-II core/shell nanocrystals. The lattice mismatch strain at interface between shell semiconductors is calculated from continuum elastic theory applied effective mass approximation to determine corresponding diameter. Calculated results are compared with bare cores (CdSe ZnSe) obtaind transmission electron microscopy images. It shown that...
An ultralow-threshold microfluidic single-mode laser is demonstrated by Emine Yegan Erdem, Hilmi Volkan Demir, and co-workers in article number 2007131, who use an on-chip cavity that has a colloidal quantum well solution as gain medium, which shows record-low threshold among all solution-based lasers of 68 μJ cm−2. This work presents significant step toward the realization practical from nanocrystals integrated into devices designed for sensing imaging applications.
In article number 2000479, Hilmi Volkan Demir and co-workers demonstrate single-mode lasing from an ultrathin self-assembled monolayer of colloidal quantum wells (CQWs) with a record thickness 7 nm. The CQWs are integrated into high-quality-factor microcavity accurate spectral/spatial alignment the cavity mode. By overcoming long-pending problem limited electrical conductivity in thicker films, such gain media may enable electrically-driven lasers.
AS-ALD has the potential to overcome many of challenges semiconductor industry is facing by enabling self-aligned fabrication, instead lithography’s cost, resit, equipment. Main in are need for pre-patterned substrates, defects outside desired growing area resulting from insufficient selectivity, and limited selection substrate materials that allow deposition. [1, 2] To these challenges, we chose first time novelty direct patterning with an AL-3D printer, also called atomic layer additive...