Is Shockley-Read-Hall recombination radiative?

Two main sources of non-radiative recombination are attributed to Shockley-Read-Hall (SRH) and Auger recombination.

What is Auger recombination process?

Auger recombination is a non-radiative process where the excess energy from the electron-hole recombination is transferred to electrons or holes that are subsequently excited to higher energy states within the same band instead of giving off photons (the radiative process).

What is recombination of electron-hole pair?

The process in which an electron, which has been excited from the valence band to the conduction band of a semiconductor, falls back into an empty state in the valence band, which is known as a hole. See Band theory of solids.

What is surface recombination?

Surface recombination can be defined as the product of surface recombination velocity and the difference in minority carrier concentrations between thermal equilibrium and at the surface, and surface recombination velocity depends on some intrinsic material parameters, such as the minority carrier diffusion length ( …

What is band to band recombination process?

This is the reversal of the light absorption process. Radiative recombination presents a phenomenon that an electron from the conduction band (higher energy state) recombines with the hole directly in the valence band (lower energy state) and releases the energy difference between the states in the form of a photon.

How do you reduce Auger recombination?

In principle, Auger recombination rate is proportional to materials’ exciton binding energy (Eb). Thus, Auger recombination can be suppressed by reducing the corresponding materials’ Eb. Here, a polar molecule, p-fluorophenethylammonium, is employed to generate quasi-2D perovskites with reduced Eb.

What are radiative and non radiative recombination processes?

Recombination mechanisms can in general be classified into two groups, radiative and nonradiative. Radiative recombination occurs when an electron in the conduction band recombines with a hole in the valence band and the excess energy is emitted in the form of a photon.

Where does recombination occur in pn junction?

The current in a p-n diode is due to carrier recombination or generation somewhere within the p-n diode structure. Under forward bias, the diode current is due to recombination. This recombination can occur within the quasi-neutral regions, within the depletion region or at the metal-semiconductor Ohmic contacts.

What are types of recombination process?

There are three types of recombination; Radiative, Defect, and Auger. Auger and Defect recombination dominate in silicon-based solar cells. Among other factors, recombination is associated with the lifetime of the material, and thus of the solar cell.

What is the Shockley-Read-Hall rate of recombination?

3.5.1Shockley-Read-Hall Recombination The balance equation for each generation-recombination center yields a Shockley-Read-Hall (SRH) rate [148] within the quasi-static approximation. The individual characteristic properties of generation-recombination centers depend strongly on the technology.

How do you model recombination lifetimes?

In (3.106), recombination lifetimes are modeled using traps of donor, acceptor, or neutral type, respectively, with the trap density and the trap capture cross section, . The effect of surface recombination is included using non-zero surface recombination velocities for electrons and holes , respectively.

How do you write down the recombination rate?

We thus can write down the recombination rate R as With r = proportionality constant, having the dimensions of volume/time; we will come back to this later. We also only assume only local equilibrium as evidenced by the use of quasi Fermi energies.

What is the Shockley-Read-Hall (SRH) rate?

The balance equation for each generation-recombination center yields a Shockley-Read-Hall (SRH) rate [148] within the quasi-static approximation. The individual characteristic properties of generation-recombination centers depend strongly on the technology.