Kinetics of Charge Transport in Wide-Band Semiconductors at the Detection of X-Ray Radiation |
| V.Ya. Degoda and A.O. Sofienko
Kyiv National Taras Shevchenko University, Department of Physics, Acad. Glushkova ave., 2, building 1, 03680 Kyiv, Ukraine |
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| As a result of absorption of quantum in a semiconductor, the generation of electron-hole pairs takes place in a small volume (diameter < 0.5 μm). Their surplus energy is lost due to the scattering on phonons of the crystal lattice. Spatial distribution of the charge carriers makes the form: of current pulse on electrodes of the crystal complicated when an external electric field is applied. We present a logical chart of construction of basic kinetic model of conductivity (XRC) in semiconductors that uses the successive in time calculation of the spatial distribution of free charge carriers and the diffusive-drift model of motion of free carriers in a solid. The basic form of current pulse in an external circle was obtained in the analytical kind for the case of an ideal semiconductor, e.g. that does not contain deep traps and recombination centers, as well as for the case of a crystal with dominant shallow or deep traps of electrons and holes. |
| DOI: 10.12693/APhysPolA.117.155 PACS numbers: 64.70.kg, 68.55.ag, 07.77.Ka |