Category: Physics of Solar Cells

Impurity photovoltaic effect

In Section 3.6.2 we have discussed non-radiative transitions between the bands and an impu – rity level. Impurities with energies for electrons in the middle of the energy gap were found to greatly enhance recombination, which is detrimental for the efficiency. In the analysis, gener­ation of electron-hole pairs by optical transitions was neglected. Now we […]

Impact ionization

Electrons and holes possessing large kinetic energies as a result of generation by high-energy photons can dissipate their kinetic energy in two ways. One is by elastic collisions with the lattice atoms, in which energy is transferred in small portions to the lattice atoms until thermal equilibrium with the lattice is established. The other is […]