A metal/oxide/p-Si structure with the ultrathin oxide is utilized as a photodetector. At positive gate bias, the dark current of the photodetector is limited by the thermal generation of minority carrier in the inversion layer. The high growth temperature (1000 C) of the gate oxide can reduce the dark current to a level as low as 3 nA/cm 2 . As biased in the inversion layer, the tunneling diode works in the deep depletion region with the soft pinning of oxide voltage, instead of the pinning of surface potential, very different from the conventional MOS diode with thick oxide.Index Terms-MOS tunneling diode, photodetector, rapid thermal oxide.

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Both NMOS and PMOS light-emitting diodes and photodetectors are demonstrated. For the ultrathin gate oxide, the tunneling gate of metal oxide silicon (MOS) diodes can be utilized as both emitters for light emitting devices and collectors for light detectors. An electron-hole plasma model is used to fit the emission spectra. A surface band bending is responsible for the bandgap reduction in electroluminescence (EL) from the MOS tunneling diode. The dark current of the photodetectors is limited by the thermal generation of minority carrier in the inversion layer. The high growth temperature(l000"C) of the oxide can reduce the dark current to a level as low as 3nAlcm2.