Polarization-induced charge carrier separation in polar and nonpolar grown GaN quantum dots

2009 ◽  
Vol 106 (8) ◽  
pp. 083707 ◽  
Author(s):  
Oliver Marquardt ◽  
Tilmann Hickel ◽  
Jörg Neugebauer
Keyword(s):  
Quantum Dots ◽  
Charge Carrier ◽  
Induced Charge ◽  
Carrier Separation

Polaron and bipolaron induced charge carrier transportation for enhanced photocatalytic H2 production

Nanoscale ◽  
2020 ◽  
Vol 12 (26) ◽  
pp. 14213-14221 ◽  
Author(s):  
T. R. Naveen Kumar ◽  
P. Karthik ◽  
B. Neppolian
Keyword(s):  
Charge Carrier ◽  
H2 Production ◽  
Efficient Charge ◽  
Induced Charge ◽  
Carrier Separation ◽  
Carrier Transportation

An alternative way for efficient charge carrier separation promoted by polarons and bipolarons of polypyrrole.

scholarly journals Mesoporous Tungsten Trioxide Photoanodes Modified with Nitrogen-Doped Carbon Quantum Dots for Enhanced Oxygen Evolution Photo-Reaction

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1502 ◽  
Author(s):  
Mabrook S. Amer ◽  
Prabhakarn Arunachalam ◽  
Abdullah M. Al-Mayouf ◽  
Saradh Prasad ◽  
Matar N. Alshalwi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Charge Carrier ◽  
Oxygen Evolution ◽  
Photoelectron Spectroscopy ◽  
Tungsten Trioxide ◽  
High Surface ◽  
Carbon Quantum Dots ◽  
Transmission Microscopy ◽  
X Ray ◽  
Carrier Separation

Nanostructured photoanodes are attractive materials for hydrogen production via water photo-electrolysis process. This study focused on the incorporation of carbon quantum dots doped with nitrogen as a photosensitizer into mesoporous tungsten trioxide photoanodes (N-CQD/meso-WO3) using a surfactant self-assembly template approach. The crystal structure, composition, and morphology of pure and N-CQD- modified mesoporous WO3 photoanodes were investigated using scanning electron and transmission microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Due to their high surface area, enhanced optical absorption, and charge-carrier separation and transfer, the resulting N-CQD/meso-WO3 photoanodes exhibited a significantly enhanced photocurrent density of 1.45 mA cm−2 at 1.23 V vs. RHE under AM 1.5 G illumination in 0.5 M Na2SO4 without any co-catalysts or sacrificial reagent, which was about 2.23 times greater than its corresponding pure meso-WO3. Moreover, the oxygen evolution onset potential of the N-CQD/meso-WO3 photoanodes exhibited a negative shift of 95 mV, signifying that both the charge-carrier separation and transfer processes were promoted.

Solvent-induced luminescence charge carrier dynamics for ZnO quantum dots

2021 ◽  
pp. 130469
Author(s):  
M. Kumar ◽  
A.H. Makki ◽  
B.P. Reddy ◽  
K.-S. Seong ◽  
S.-H. Park
Keyword(s):  
Quantum Dots ◽  
Charge Carrier ◽  
Carrier Dynamics ◽  
Charge Carrier Dynamics ◽  
Zno Quantum Dots
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