Band gap modulation and indirect to direct band gap transition in ZnS/Si and Si/ZnS core/shell nanowires

2017 ◽  
Vol 524 ◽  
pp. 163-172 ◽  
Author(s):  
Shafiq Ur Rehman ◽  
Z.Y. Li ◽  
H.M. Li ◽  
Z.J. Ding
Keyword(s):  
Band Gap ◽  
Core Shell ◽  
Direct Band Gap ◽  
Direct Band ◽  
Band Gap Modulation ◽  
Shell Nanowires

Band gap modulation of Si-C binary core/shell nanowires by composition and ratio

2015 ◽  
Vol 26 (27) ◽  
pp. 275201 ◽  
Author(s):  
Huilong Dong ◽  
Zhenyu Guo ◽  
Keith Gilmore ◽  
Chunmiao Du ◽  
Tingjun Hou ◽  
...  
Keyword(s):  
Band Gap ◽  
Core Shell ◽  
Band Gap Modulation ◽  
Shell Nanowires

scholarly journals Growth and Optical Properties of Direct Band Gap Ge/Ge0.87Sn0.13 Core/Shell Nanowire Arrays

Nano Letters ◽  
2017 ◽  
Vol 17 (3) ◽  
pp. 1538-1544 ◽  
Author(s):  
S. Assali ◽  
A. Dijkstra ◽  
A. Li ◽  
S. Koelling ◽  
M. A. Verheijen ◽  
...  
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Nanowire Arrays ◽  
Core Shell ◽  
Direct Band Gap ◽  
Direct Band

Synthesis of Colloidal InP/ZnS Nanocrystals for a Photosensitizer

2012 ◽  
Vol 1409 ◽  
Author(s):  
Seungyong Lee ◽  
Vanga R. Reddy ◽  
Jiang Wu ◽  
Rick Eyi ◽  
Omar Manasreh
Keyword(s):  
Optical Absorption ◽  
Band Gap ◽  
Chemical Stability ◽  
Semiconductor Nanocrystals ◽  
Solar Spectrum ◽  
Core Shell ◽  
Direct Band Gap ◽  
Direct Band ◽  
Zns Nanocrystals ◽  
Spectrum Region

ABSTRACTIts intrinsic nontoxicity makes the direct band gap InP/ZnS core/shell be one of the most promising semiconductor nanocrystals for optoelectric applications, with the advantage of tuning the optical absorption range in the desired solar spectrum region. Highly luminescent and monodisperse InP/ZnS nanocrystals were synthesized in a non-coordinating solvent under a thorough degassing process. By varying synthesis scheme, different size InP/ZnS nanocrystals were grown. For the purpose of ensuring air stability, ZnS shell was grown. This ZnS shell improves the chemical stability in terms of oxidation prevention. Measurements of absorption and emission were performed on different InP/ZnS nanocrystals with different sizes. As expected, the measurements show a red-shift as the size of the InP/ZnS nanocrystals increased.

The band gap modulation of monolayer Ti2CO2 by strain

RSC Advances ◽  
2015 ◽  
Vol 5 (39) ◽  
pp. 30438-30444 ◽  
Author(s):  
Xue-fang Yu ◽  
Jian-bo Cheng ◽  
Zhen-bo Liu ◽  
Qing-zhong Li ◽  
Wen-zuo Li ◽  
...  
Keyword(s):  
Band Gap ◽  
Uniaxial Strain ◽  
Biaxial Strain ◽  
Direct Band Gap ◽  
Direct Band ◽  
Band Gap Modulation

Monolayer Ti2CO2: indirect–direct band gap transition under biaxial strain of ∼4% and uniaxial strain of ∼6%.

One-Dimensional TiO2@GaON Core-Shell Nanowires with Controlled Shell Thickness from Atomic Layer Deposition for Stable and Efficient Photoelectrochemical Water Splitting

2019 ◽  
Author(s):  
Jiajia Tao ◽  
Hong-Ping Ma ◽  
Kaiping Yuan ◽  
Yang Gu ◽  
Jianwei Lian ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Band Gap ◽  
Water Splitting ◽  
Atomic Layer ◽  
Photoelectrochemical Water Splitting ◽  
Core Shell ◽  
Photoelectrochemical Performance ◽  
Highly Efficient ◽  
Layer Deposition ◽  
Shell Nanowires

<div>As a promising oxygen evolution reaction semiconductor, TiO2 has been extensively investigated for solar photoelectrochemical water splitting. Here, a highly efficient and stable strategy for rationally preparing GaON cocatalysts on TiO2 by atomic layer deposition is demonstrated, which we show significantly enhances the</div><div>photoelectrochemical performance compared to TiO2-based photoanodes. For TiO2@20 nm-GaON core-shell nanowires a photocurrent density up to 1.10 mA cm-2 (1.23 V vs RHE) under AM 1.5 G irradiation (100 mW cm-2) has been achieved, which is 14 times higher than that of TiO2 NWs. Furthermore, the oxygen vacancy formation on GaON as well as the band gap matching with TiO2 not only provides more active sites for water oxidation but also enhances light absorption to promote interfacial charge separation and migration. Density functional theory studies of model systems of GaON-modified TiO2 confirm the band gap reduction, high reducibility and ability to activate water. The highly efficient and stable systems of TiO2@GaON core-shell nanowires provide a deeper understanding and universal strategy for enhancing photoelectrochemical performance of photoanodes now available. </div>

Optical Studies of Poly (N-Carbazole) (PVK) Blending with Polyvinylpyrrolidone (PVP) Using Tauc/Davis-Mott Model

2013 ◽  
Vol 652-654 ◽  
pp. 527-531 ◽  
Author(s):  
A.N. Alias ◽  
T.I. Tunku Kudin ◽  
Z.M. Zabidi ◽  
M.K. Harun ◽  
Ab Malik Marwan Ali ◽  
...  
Keyword(s):  
Band Gap ◽  
Urbach Energy ◽  
Quartz Substrate ◽  
Optical Studies ◽  
Direct Band Gap ◽  
Mott Model ◽  
Blended Polymer ◽  
Electronic Parameters ◽  
Direct Band ◽  
Indirect Band Gap

The optical absorption spectra of blended poly (N-carbazole) (PVK) with polyvinylpyrrolidone (PVP) in various compositions are investigated. A doctor blade technique was used to coat the blended polymer on a quartz substrate. The electronic parameters such as absorption edge (Ee), allowed direct band gap (Ed), allowed indirect band gap (Ei), Urbach edge (Eu) and steepness parameter (γ) were calculated using Tauc/Davis-Mott Model. The results reveal that the Ee, Ed and Ei increase with increasing of PVP ratio. There also have variation changing in Urbach energy and steepness parameter.

Theoretical Derivations of a Direct Band Gap Semiconductor of SiC Doped with Ge

2014 ◽  
Vol 44 (1) ◽  
pp. 167-176 ◽  
Author(s):  
Adit Ghosh ◽  
Chandrika Varadachari
Keyword(s):  
Band Gap ◽  
Direct Band Gap ◽  
Direct Band
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