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Hybrid silicon pixel detectors are currently used in the innermost trackingsystem of the Compact Muon Solenoid (CMS) experiment. Radiation tolerance up tofluences expected for a few years of running of the Large Hadron Collider (LHC)has already been proved, although some degradation of the part of the silicondetector closer to the interaction point is expected. During the LHC upgradephases, the level of dose foreseen for the silicon pixel detector will be muchhigher. To face this aspect, dedicated irradiation tests with fluences above$\mathcal{O}(10^{15})$ n$_{\textrm{eq}}$/cm$^2$ have been performed on thesilicon sensor and readout chip. Changes in the operation of the sensor andreadout chip as a function of the fluence are presented. The charge collectionefficiency has been studied: partial recovery of the detector efficiency can beachieved by operating the detectors in a controlled environment and at higherbias voltage.

Study of the readout chip and silicon sensor degradation for the CMS pixel upgrade