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Photocurrent is the electric current through a photosensitive device, such as a photodiode, as the result of exposure to radiant power. The photocurrent may occur as a result of the photoelectric , photoemissive, or photovoltaic effect .
Since the work done by the retarding potential in stopping the electron of charge e is eV o, the following must hold eV o = K max. The current-voltage curve is sigmoidal, but its exact shape depends on the experimental geometry and the electrode material properties.
A current–voltage characteristic or I–V curve (current–voltage curve) is a relationship, typically represented as a chart or graph, between the electric current through a circuit, device, or material, and the corresponding voltage, or potential difference, across it.
The first demonstration of the photovoltaic effect, by Edmond Becquerel in 1839, used an electrochemical cell. He explained his discovery in Comptes rendus de l'Académie des sciences, "the production of an electric current when two plates of platinum or gold immersed in an acid, neutral, or alkaline solution are exposed in an uneven way to solar radiation."
The general form of the solution is a curve with decreasing as increases (see graphs lower down). The slope at small or negative V out {\displaystyle V_{\text{out}}} (where the W function is near zero) approaches − 1 / ( R S + R SH ) {\displaystyle -1/(R_{\text{S}}+R_{\text{SH}})} , whereas the slope at high V out {\displaystyle V_{\text{out ...
Graph showing Child–Langmuir law. S and d are constant and equal to 1. First proposed by Clement D. Child in 1911, Child's law states that the space-charge-limited current (SCLC) in a plane-parallel vacuum diode varies directly as the three-halves power of the anode voltage V {\displaystyle V} and inversely as the square of the distance d ...
A potential, E, is delivered through the working electrode. The slope of the potential vs. time graph is called the scan rate and can range from mV/s to 1,000,000 V/s. [ 3 ] The working electrode is one of the electrodes at which the oxidation/reduction reactions occur—the processes that occur at this electrode are the ones being monitored.
Transient photocurrent (TPC) is a measurement technique, typically employed in the physics of thin film semiconductors. TPC allows to study the time-dependent (on a microsecond time scale) extraction of charges generated by photovoltaic effect in semiconductor devices, such as solar cells .