Outdoor solar column light science:

In a solar cell, the five electrons of the group V element, except for the four electrons to be combined, have an electron, which is gently bound by the Coulomb force generated by the excess positive charge at the position of P, in the form of a hydrogen atom. The Bohr model rotates on the orbit. E1 is the binding energy of the hydrogen atom (136 eV). If the effective mass mm-03 of silicon and the dielectric constant = 119 are used, the donor energy of silicon is bound to E. =0.032eV=32meV. This binding energy starts at the bottom of the band at the band, only E. The donor level is determined at a small energy location. As the temperature increases, the electrons will be released from the donor and spread into the interior of the body. If you can use the energy map,

But in fact impurities have their own characteristics. There are both shallow levels of E less than 100 meV like phosphorus (P) and higher than 400 meV like chromium (Cr).