In semiconductors, "electron" is a shorthand for "free electron", meaning that the electron is not bound to any atom/atoms. The current in a semiconductor is produced by Recombination is when (a) an electron falls into a hole (b) a positive and a negative ion bond together (c) a valence electron becomes a conduction electron (d) a crystal is formed 13. 2.3 Carrier Generation and Recombination Carrier generation is a process where electron-hole pairs are created by exciting an electron from the valence band of the semiconductor to the conduction band, thereby creating a hole in the valence band. Since both carrier types need to be available in the recombination process, the rate is expected to be proportional to the product of n and p.However in thermal equilibrium the recombination rate must equal the generation rate since there is no net recombination or generation. At highly dense electron-hole plasma, the recombination probability is computed using simple Fermi's Golden Rule. Recombination is when (a) an electron falls into a hole (b) and a negative ion bond together (c) a valence electron becomes a conduction electron (d) a crystal is formed. Our detailed calculations based on a many-body theory give the Coulomb correlation factors for a wide range of carrier densities and temperatures. Electron-hole pairs are produced by (a) recombination (b) thermal energy (c) ionization (d) doping 15. The generation of electrons and holes in anthracene crystals by x rays from a 600-kV pulsed x-ray source was studied. Similarly, a "hole" means a covalent bond with one electron missing. The current passing through a pn diode in electrons per second equals the rate of electron-hole recombination (illus. Minimizing electron-hole pair recombination through band-gap engineering in novel ZnO-CeO 2-rGO ternary nanocomposite for photoelectrochemical and photocatalytic applications. As a result the e-h pair disappear; this process is called recombination. Each of these processes has own probability. Electron-hole recombination requires an excited semiconductor in which both electrons and holes occupy the same volume of the crystal. Carrier generation is a process where electron-hole pairs are created by exciting an electron from the valence band of the semiconductor to the conduction band, thereby creating a hole in the valence band. & Free, M.L. The average energy deposited per electron-hole pair created W was found to be 3×103 eV. 2.11.3 Band-to-Band recombination Band-to-band recombination depends on the density of available electrons and holes. Recombination is when (a) an electron falls into a hole (b) a positive and a negative ion bond together (c) a valence electron becomes a conduction electron (d) a crystal is formed 16. Here you have to know recombination mechanism in order to compute a matrix element: luminescence, phonon-assisted, through traps. 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