Potential Difference
... reactions in a rechargeable cell can be reversed by using an external energy source to run electricity back through the cell. The reversed flow of electrons restores the reactants that are used up when the cell produces electricity ...
... reactions in a rechargeable cell can be reversed by using an external energy source to run electricity back through the cell. The reversed flow of electrons restores the reactants that are used up when the cell produces electricity ...
How Fermi level pinning impacts the energy level
... electrode. Thus one can create situations where the donor is Fermi-level pinned by the work function of the acceptor film and vice versa. This then requires charge transfer across the organic heterojunction, and electrostatic potential gradients result, even for material pairs that would not undergo ...
... electrode. Thus one can create situations where the donor is Fermi-level pinned by the work function of the acceptor film and vice versa. This then requires charge transfer across the organic heterojunction, and electrostatic potential gradients result, even for material pairs that would not undergo ...
EFFICIENCY IN SMALL PERMANENT MAGNET DC GENERATORS
... influences the overall efficiency. Generally, the maximum efficiency occurs when the source (generator) impedance is matched to the external load impedance. In dc generators, impedance effects occur when the inductance of the generator windings interacts in any way with the load. A noninductive load ...
... influences the overall efficiency. Generally, the maximum efficiency occurs when the source (generator) impedance is matched to the external load impedance. In dc generators, impedance effects occur when the inductance of the generator windings interacts in any way with the load. A noninductive load ...
Shockley–Queisser limit
In physics, the Shockley–Queisser limit or detailed balance limit refers to the maximum theoretical efficiency of a solar cell using a p-n junction to collect power from the cell. It was first calculated by William Shockley and Hans Queisser at Shockley Semiconductor in 1961. The limit is one of the most fundamental to solar energy production, and is considered to be one of the most important contributions in the field.The limit places maximum solar conversion efficiency around 33.7% assuming a single p-n junction with a band gap of 1.34 eV (using an AM 1.5 solar spectrum). That is, of all the power contained in sunlight falling on an ideal solar cell (about 1000 W/m²), only 33.7% of that could ever be turned into electricity (337 W/m²). The most popular solar cell material, silicon, has a less favourable band gap of 1.1 eV, resulting in a maximum efficiency of 33.3%. Modern commercial mono-crystalline solar cells produce about 24% conversion efficiency, the losses due largely to practical concerns like reflection off the front surface and light blockage from the thin wires on its surface.The Shockley–Queisser limit only applies to cells with a single p-n junction; cells with multiple layers can outperform this limit. In the extreme, with an infinite number of layers, the corresponding limit is 86% using concentrated sunlight.