The Peculiarities of the Temperature Broadening of Raman Light Scattering Lines in Zn(Cd)Ga2Se4 Single Crystals

1990 ◽  
Vol 162 (1) ◽  
pp. K63-K66 ◽  
Author(s):  
S. I. Radautsan ◽  
I. M. Tiginyanu ◽  
V. V. Ursakii ◽  
V. M. Fomin ◽  
E. P. Pokatilov
Keyword(s):  
Light Scattering ◽  
Single Crystals ◽  
Raman Light Scattering

Inspection Of Recombination Active Defects For Sige And Solar Cells

1996 ◽  
Vol 442 ◽  
Author(s):  
O.V. Astafiev ◽  
V.P. Kalinushkin ◽  
N.V. Abrosimov
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Light Scattering ◽  
Grain Boundary ◽  
Single Crystals ◽  
Defect Structure ◽  
Scattering Method ◽  
Recombination Activity ◽  
Cell Production ◽  
Materials Used

AbstractMapping Low Angle Light Scattering method (MLALS) is proposed to study defect structure in materials used for solar cell production. Several types of defects are observed in Czochralski Si1−xGex (0.022<x<0.047) single crystals. Recombination activity of these defects is investigated. The possibility of contactless visualisation of grain boundary recombination in polysilicon is also demonstrated.

scholarly journals Ontogenetic Color Switching in Lizards as a by-Product of Guanine Cell Development

2022 ◽  
Author(s):  
Gan Zhang ◽  
Venkata Jayasurya Yallapragada ◽  
Michal Shemesh ◽  
Avital Wagner ◽  
Alexander Upcher ◽  
...  
Keyword(s):  
Light Scattering ◽  
Predation Risk ◽  
Single Crystals ◽  
Cell Development ◽  
Formation Mechanisms ◽  
Blue Colour ◽  
Naturally Occurring ◽  
Color Switching

Many animals undergo dramatic changes in colour during development1,2. Changes in predation risk during ontogeny are associated with spectacular switches in defensive colours, typically involving the replacement of skin or the production of new pigment cells3. Ontogenetic colour systems are ideal models for understanding the evolution and formation mechanisms of animal colour which remain largely enigmatic2. We show that defensive colour switching in lizards arises by reorganization of a single photonic system, as an incidental by-product of chromatophore maturation. The defensive blue tail colour of hatchling A. beershebensis lizards is produced by light scattering from premature guanine crystals in underdeveloped iridophore cells. Camouflaged adult tail colours emerge upon reorganization of the guanine crystals into a photonic reflector during chromatophore maturation. The substituent guanine crystals form by the attachment of individual nanoscopic plates, which coalesce during growth to form single crystals. Our results show that the blue colour of hatchlings is a fortuitous, but necessary, precursor to the development of adult colour. Striking functional colours in animals can thus arise not as distinct evolutionary innovations but via exploitation of the timing of naturally occurring changes in chromatophore cell development.

Sign in / Sign up

Export Citation Format

Share Document