Charge collection measurements performed on heavily irradiated p-spray dofz pixel sensors with a grazing angle hadron beam provide a sensitive determination of the electric field within the detectors. The data are compared with a complete charge transport simulation of the sensor which includes signal trapping and charge induction effects. A linearly varying electric field based upon the standard picture of a constant type-inverted effective doping density is inconsistent with the data. A two-trap double junction model implemented in ISE TCAD software can be tuned to produce a doubly-peaked electric field which describes the data reasonably well at two different fluences. The modeled field differs somewhat from previous determinations based upon the transient current technique. The model can also account for the level of signal trapping observed in the data.
@article{arxiv.physics/0409049,
title = {Type inversion in irradiated silicon: a half truth},
author = {M. Swartz and D. Bortoletto and V. Chiochia and L. Cremaldi and S. Cucciarelli and A. Dorokhov and M. Konecki and K. Prokofiev and C. Regenfus and T. Rohe and D. A. Sanders and S. Son and T. Speer},
journal= {arXiv preprint arXiv:physics/0409049},
year = {2007}
}
Comments
18 pages, LaTeX document, 11 figures, version 2 fixes small typos