diffusion length वाक्य
उदाहरण वाक्य
मोबाइल
- It has a high charge carrier mobility and charge carrier lifetime that allow light-generated electrons and holes to move far enough to be extracted as current, instead of losing their energy as heat within the cell . effective diffusion lengths are some 100 nm for both electrons and holes.
- In thin film cells ( such as amorphous silicon ), the diffusion length of minority carriers is usually very short due to the existence of defects, and the dominant charge separation is therefore drift, driven by the electrostatic field of the junction, which extends to the whole thickness of the cell.
- The strength of diffusion damping is calculated by a mathematical expression for the " damping factor ", which figures into the Boltzmann equation, an equation which describes the amplitude of perturbations in the CMB . The strength of the diffusion damping is chiefly governed by the distance photons travel before being scattered ( diffusion length ).
- However, this mechanism can be excluded for two reasons; first, cantilever coatings have been stripped experimentally and no change in signal was observed; second, the calculated thermal diffusion length in SiNx and Si cantilevers at the SJEM working frequency ( typically 10 kHz ~ 100 kHz ) is small, much smaller than the length of the cantilever ( typically 100 um ).
- This case is valid when some solution with concentration " n " 0 is put in contact with a layer of pure solvent . ( Bokstein, 2005 ) The length 2 is called the " diffusion length " and provides a measure of how far the concentration has propagated in the " x "-direction by diffusion in time " t " ( Bird, 1976 ).
- Once you get to the energy levels of deep violets and ultraviolets, silicon no longer provides very efficient photovoltaic conversion since the absorption coefficient for these short wavelengths is usually so high that photons don't make it to the active region ( or within one diffusion length of ) before being absorbed, meaning they do not contribute to electrical photocurrent .-- mattb 22 : 32, 21 May 2007 ( UTC)
- And because high-energy ( blue ) light is absorbed very close to the surface, considerable recombination at the front surface will affect the " blue " portion of the QE . Similarly, lower energy ( green ) light is absorbed in the bulk of a solar cell, and a low diffusion length will affect the collection probability from the solar cell bulk, reducing the QE in the green portion of the spectrum.
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