Popis: |
We propose an analytical expression for dose dependent ion-implanted impurity concentration profiles using a main function and a tail function. The main function describes the profile near the peak region and the tail function describes the channeling tail profile. The tail function can express various tail lengths with various shapes. We first use a Pearson IV function as the main function, and show that it covers B, BF2, P, AsIn, and Sb ion-implanted impurity concentration profiles in the energy range of 10 to 180 keV and in the full dose range. We also demonstrate that some of the ion-implanted impurity concentration profiles can be expressed with a simpler main function: a Gaussian and a joined half Gaussian function. |