Yazar "Sahin, Mehmet" için listeleme
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Advanced tunability of optical properties of CdS/ZnSe/ZnTe/CdSe multi-shell quantum dot by the band edge engineering
Koc, Fatih; Kavruk, Ahmet Emre; Sahin, Mehmet (ELSEVIER, 2022)In this study, the advanced manipulability of wave functions in a type-II multi-shell hetero-nanostructure (MS-HNS) and the tunability of radiative exciton lifetime over a wide range with and/or without changing in transition ... -
The angular electronic band structure and free particle model of aromatic molecules: High-frequency photon-induced ring current
Oncan, Mehmet; Koc, Fatih; Sahin, Mehmet; Koksal, Koray (WORLD SCIENTIFIC PUBL CO PTE LTD5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE, 2017)This work introduces an analysis of the relationship of first-principles calculations based on DFT method with the results of free particle model for ring-shaped aromatic molecules. However, the main aim of the study is ... -
Antibacterial type-II InP/ZnO quantum dots via multimodal reactive oxygen species
Khan, Saad Ullah; Eren, Guncem Ozgun; Atac, Nazli; Onal, Asim; Qureshi, Mohammad Haroon; Cooper, Francis Korshe; Almammadov, Toghru; Kolemen, Safacan; Sahin, Mehmet; Can, Fusun; Nizamoglu, Sedat (ELSEVIER SCIENCE SA, 2024)The emergence of multidrug-resistant bacteria as a global health threat has necessitated the exploration of alternative treatments to combat bacterial infections. Among these, photocatalytic nanomaterials such as quantum ... -
Cadmium-Free and Efficient Type-II InP/ZnO/ZnS Quantum Dots and Their Application for LEDs
Eren, Guncem Ozgun; Sadeghi, Sadra; Jalali, Houman Bahmani; Ritter, Maximilian; Han, Mertcan; Baylam, Isinsu; Melikov, Rustamzhon; Onal, Asim; Oz, Fatma; Sahin, Mehmet; Ow-Yang, Cleva W.; Sennaroglu, Alphan; Lechner, Rainer T.; Nizamoglu, Sedat (AMER CHEMICAL SOC1155 16TH ST, NW, WASHINGTON, DC 20036, 2021)It is a generally accepted perspective that type-II nanocrystal quantum dots (QDs) have low quantum yield due to the separation of the electron and hole wavefunctions. Recently, high quantum yield levels were reported for ... -
Cation exchange mediated synthesis of bright Au@ZnTe core-shell nanocrystals
Sadeghi, Sadra; Melikov, Rustamzhon; Sahin, Mehmet; Nizamoglu, Sedat (IOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND, 08.01.2021)The synthesis of heterostructured core-shell nanocrystals has attracted significant attention due to their wide range of applications in energy, medicine and environment. To further extend the possible nanostructures, ... -
Colloidal Aluminum Antimonide Quantum Dots
Jalali, Houman Bahmani; Sadeghi, Sadra; Sahin, Mehmet; Ozturk, Hande; Ow-Yang, Cleva W.; Nizamoglu, Sedat (AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2019)AlSb is a less studied member of the III-V semiconductor family, and herein, we report the colloidal synthesis of AlSb quantum dots (QDs) for the first time. Different sizes of colloidal AlSb QDs (5 to 9 nm) were produced ... -
A detailed investigation of electronic and intersubband optical properties of AlxGa(1-x)As/Al0.3Ga0.7As/AlyGa1-yAs/Al0.3Ga0.7As multi-shell quantum dots
Kavruk, Ahmet Emre); Sahin, Mehmet; Atav, Ulfet (IOP Publishing Ltd, 2014)In this study, we have investigated the electronic and intersubband optical properties of Al x Ga1-x As/Al0.3Ga0.7As/Al y Ga1-y As/Al0.3Ga0.7As multi-shell quantum dot heterostructures as a function of the Al doping ... -
A detailed investigation of electronic and optical properties of the exciton, the biexciton and charged excitons in a multi-shell quantum dot nanocrystal
Akturk, Abdurrahman; Sahin, Mehmet; Koc, Fatih; Erdinc, Ahmet (IOP Publishing Ltd, 2014)In the present study, the electronic and optical properties of the exciton (X), the biexciton (XX) and charged excitons (X- and X+) in a multi-shell quantum dot nanocrystal have been systematically explored in detail. The ... -
A detailed investigation of the electronic properties of a multi-layer spherical quantum dot with a parabolic confinement
Akgul, Selcuk; Koksal, Koray; Sahin, Mehmet (ELSEVIER, 2012)In this work, we aim a detailed investigation of the electronic properties of a spherical multi-layer quantum dot with and without a hydrogenic impurity. The structure is introduced in the form of core/ shell/well/shell ... -
Double Quantum Ring under an Intense Nonresonant Laser Field: Zeeman and Spin-Orbit Interaction Effects
Mora-Ramos, Miguel E.; Vinasco, Juan A.; Radu, Adrian; Restrepo, Ricardo L.; Morales, Alvaro L.; Sahin, Mehmet; Mommadi, Omar; Sierra-Ortega, Jose; Escorcia-Salas, Gene Elizabeth; Heyn, Christian; Duque, Derfrey A.; Duque, Carlos A. (MDPI, 2023)We theoretically investigate the properties of an electron energy spectrum in a double GaAs-Al0.3Ga0.7As quantum ring by using the effective mass and adiabatic approximations, together with a realistic description of the ... -
Effect of a buffer layer between the shell and ligand on the optical properties of an exciton and biexciton in type-II quantum dot nanocrystals
Koc, Fatih; Koksal, Koray; Sahin, Mehmet (TAYLOR & FRANCIS LTD2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND, 2017)In this study, we have investigated the effect of the buffer layers on the electronic and optical properties of an exciton (X) and a biexciton (XX) in a type-II CdTe/CdSe quantum dot nanocrystal. In an experimental study, ... -
The effect of dilute nitrogen on nonlinear optical properties of the InGaAsN/GaAs single quantum wells
Sahin, Mehmet; Koksal, Koray (SPRINGER, 2012)In this study, we investigate the linear and third order nonlinear optical properties of InGaAsN/GaAs depending on nitrogen content and laser dressing parameter. As theoretical models, band anticrossing and model solid ... -
Effect of the shell material and confinement type on the conversion efficiency of core/shell quantum dot nanocrystal solar cells
Sahin, Mehmet (IOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND, 2018)In this study, the effects of the shell material and confinement type on the conversion efficiency of core/shell quantum dot nanocrystal (QDNC) solar cells have been investigated in detail. For this purpose, the conventional, ... -
Effective Neural Photostimulation Using Indium-Based Type-II Quantum Dots
Jalali, Houman Bahmani; Aria, Mohammad Mohammadi; Dikbas, Ugur Meric; Sadeghi, Sadra; Kumar, Baskaran Ganesh; Sahin, Mehmet; Kavakli, Ibrahim Halil; Ow-Yang, Cleva W.; Nizamoglu, Sedat (AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA, 2018)Light-induced stimulation of neurons via photoactive surfaces offers rich opportunities for the development of therapeutic methods and high-resolution retinal prosthetic devices. Quantum dots serve as an attractive building ... -
The electronic and optical properties of a triexciton in CdSe/ZnS core/shell quantum dot nanocrystals
Akturk, Abdurrahman; Tas, Hatice; Koksal, Koray; Sahin, Mehmet (TAYLOR & FRANCIS LTD2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND, 2016)In the study, we aim to investigate the electronic and optical properties of single excitons, biexcions and triexcitons in a CdSe/ZnS core/shell quantum dot nanocrystal. The electronic structure has been determined by ... -
The electronic and optical properties of an exciton, biexciton and charged excitons in CdSe/CdTe-based multi-shell type-II quantum dot nanocrystals
Koc, Fatih; Sahin, Mehmet (SPRINGER HEIDELBERG, TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY, 2019)It has been recently reported that multi-shell type-II quantum dot nanocrystals (QDNCs) have higher quantum yields. Besides these higher quantum yields of multi-shell type-II QDNCs, additional second layer has been a ... -
Electronic and optical properties of single excitons and biexcitons in type-II quantum dot nanocrystals
Koc, Fatih; Sahin, Mehmet (AIP Publishing, 2014)In this study, a detailed investigation of the electronic and optical properties (i.e., binding energies, absorption wavelength, overlap of the electron-hole wave functions, recombination oscillator strength, etc.) of an ... -
The electronic properties of a core/shell/well/shell spherical quantum dot with and without a hydrogenic impurity
Sahin, Mehmet; Tas, Hatice (AIP Publishing1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501, 2012)In this study, we have performed a detailed investigation of the electronic properties of a core/shell/well/shell multi-layered spherical quantum dot, such as energy eigenvalues, wave functions, electron probability ... -
The electronic properties of a two-electron multi-shell quantum dot-quantum well heterostructure
Aydin, Rasit; Sahin, Mehmet (AIP Publishing, 2013)A detailed investigation of the electronic properties of a double electron in a core/shell/well/shell quantum dot heterostructure has been systematically studied for cases with and without an on-center donor impurity. For ... -
Elliptical Quantum Rings with Variable Heights and under Spin-Orbit Interactions
Mora-Ramos, Miguel E.; Vinasco, Juan A; Radu, A.; Restrepo, Ricardo L.; Morales, Alvaro L.; Sahin, Mehmet; Mommadi, Omar; Sierra-Ortega, Jose; Escorcia-Salas, Gene Elizabeth; Duque, Carlos A. (MDPI, 2023)We investigate the electronic properties of a semiconductor quantum ring with an elliptical shape and non-uniform height, allowing for distributed quantum-dot-like bulges along its perimeter. The adiabatic approximation ...
