Indirect–direct band gap transition and enhanced optical absorption of GaP/AlP random superlattice

1995 ◽  
Vol 66 (11) ◽  
pp. 1400-1402 ◽  
Author(s):  
E. G. Wang ◽  
C. S. Ting
Keyword(s):  
Optical Absorption ◽  
Band Gap ◽  
Direct Band Gap ◽  
Direct Band

scholarly journals Optical Absorption Exhibits Pseudo-Direct Band Gap of Wurtzite Gallium Phosphide

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Bruno C. da Silva ◽  
Odilon D. D. Couto ◽  
Hélio T. Obata ◽  
Mauricio M. de Lima ◽  
Fábio D. Bonani ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Band Gap ◽  
Gallium Phosphide ◽  
Direct Band Gap ◽  
Direct Band

scholarly journals Author Correction: Optical Absorption Exhibits Pseudo-Direct Band Gap of Wurtzite Gallium Phosphide

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Bruno C. da Silva ◽  
Odilon D. D. Couto ◽  
Hélio T. Obata ◽  
Mauricio M. de Lima ◽  
Fábio D. Bonani ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Band Gap ◽  
Gallium Phosphide ◽  
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.

Pressure coefficient of the direct band gap ofAlxGa1−xAsfrom optical absorption measurements

1979 ◽  
Vol 20 (6) ◽  
pp. 2398-2400 ◽  
Author(s):  
N. Lifshitz ◽  
A. Jayaraman ◽  
R. A. Logan ◽  
R. G. Maines
Keyword(s):  
Optical Absorption ◽  
Band Gap ◽  
Pressure Coefficient ◽  
Direct Band Gap ◽  
Direct Band ◽  
Absorption Measurements

Photovoltaic Performance of Thin-Film CdTe for Solar Cell Applications

2021 ◽  
Vol 10 (1) ◽  
pp. 91-97
Author(s):  
A. Hendi ◽  
R. Alkhraif ◽  
H. Alshehri ◽  
F. AlKallas ◽  
M. Almoneef ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cell ◽  
Optical Absorption ◽  
Band Gap ◽  
Photovoltaic Performance ◽  
Open Circuit ◽  
Potential Candidate ◽  
Direct Band Gap ◽  
Theoretical Support ◽  
Direct Band

In the current investigation, we report a theoretical study to acquire the highest feasible efficiency of cadmium telluride (CdTe) thin-films. It is well recognized that CdTe crystallizes in cubic zinc-blende structure and its direct band gap of 1.5 eV turned it out as a potential candidate for photovoltaic (PV) applications. Our calculations are founded on Shockley-Queisser (SQ) limit to simulate the open-circuit voltage, current density, and filling factor versus the variation of photon energy up to 4.0 eV. These key parameters of SQ change with the variation of energy between 0.3 to 3.5 eV. This is owing to the strong optical absorption (> 104 cm−1) and direct band gap of 1.5 eV, which make CdTe thin-film suitable for single junction solar cell and ideal for PV applications. It is observed that the optical absorption enhances as the thickness of the absorbed layer increases. This will effectively provide a theoretical support to the industry of global solar energy that is anticipated to be sustainable in the future.

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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