Recombination rate constant
This page was last edited on recombination rate constant Aprilat Retrieved 23 April The mechanism causing LED efficiency droop recombination rate constant identified in as Auger recombination, which met with a mixed reaction. They are also critical to a full analysis of p-n junction devices such as BJTs and p-n junction diodes. Because the valence band is so nearly full, its electrons are not mobile, and cannot flow as electric current.
Recombination rate constant Read Edit View history. The Auger recombination can be calculated from the equation [ clarification needed ]:. Carrier generation describes processes by which electrons gain energy and move from the valence band to the conduction band, producing two mobile carriers; while recombination describes processes by which a conduction band electron loses energy and re-occupies the energy state of an electron hole in the valence band.
Carrier generation describes processes by which electrons gain energy and move from the valence band to the conduction band, producing two recombination rate constant carriers; while recombination describes processes by which a conduction band electron loses energy and re-occupies the energy state of an electron hole in the valence band. Since this process is a three-particle interaction, it is normally only significant in non-equilibrium recombination rate constant when the carrier density is very high. In a material at thermal equilibrium generation and recombination are balanced, so that the net charge carrier density remains constant.
At absolute zero temperature, all of the electrons recombination rate constant energy below the Fermi level; but at non-zero temperatures the energy levels are filled following a Boltzmann distribution. The conduction band, above the Fermi level, is normally nearly completely empty. In Auger recombination recombination rate constant energy is given to a third carrier, which is excited to a higher energy level without moving to another energy band. This page was last edited on 11 Aprilat
The Auger effect process is not easily produced, because the third particle would have to begin the process in the unstable high-energy state. Views Read Edit View history. This effect is the basis of LEDs. This effect is the basis of LEDs. Wikipedia articles needing clarification from June
Because the valence band is so nearly full, its electrons are not mobile, and cannot flow as electric current. Like other solids, semiconductor materials recombination rate constant an electronic band structure determined by the crystal properties of the material. The conduction band, above the Fermi level, is normally nearly completely empty. Condensed matter physics Optoelectronics Charge carriers. They are also critical to a full analysis of p-n junction devices such as BJTs and p-n junction diodes.
Other frequently quoted evidence against Auger as the main droop causing mechanism is the low-temperature dependence of this recombination rate constant which is opposite to that found for the drop. The Auger recombination can be calculated from the equation [ clarification needed ]:. The electron—hole pair is the fundamental recombination rate constant of generation and recombination, corresponding to an electron transitioning between the valence band and the conduction band where generation of electron is a transition from the valence band to the conduction band and recombination leads to a reverse transition.