A novel photosensitive hybrid field-effect transistor （FET） which consists of a multiple-shell of organic porphyrin film/oxide/silicon nanowires is presented. Due to the oxide shell around the nanowires, photoswitch...A novel photosensitive hybrid field-effect transistor （FET） which consists of a multiple-shell of organic porphyrin film/oxide/silicon nanowires is presented. Due to the oxide shell around the nanowires, photoswitching of the current in the hybrid nanodevices is guided by the electric field effect, induced by charge redistribution within the organic film. This principle is an alternative to a photoinduced electron injection, valid for devices relying on direct junctions between organic molecules and metals or semiconductors. The switching dynamics of the hybrid nanodevices upon violet light illumination is investigated and a strong dependence on the thickness of the porphyrin film wrapping the nanowires is found. Furthermore, the thickness of the organic films is found to be a crucial parameter also for the switching efficiency of the nanowire FET, represented by the ratio of currents under light illumination （ON） and in dark conditions （OFF）. We suggest a simple model of porphyrin film charging to explain the optoelectronic behavior of nanowire FETs mediated by organic film/oxide/semiconductor junctions.展开更多
In this paper the operation principle of the GaAs switch of the type of substrate-edge excitation is set forward, and the configuration parameters of the microstrip switch are designed. In the meantime, a method of pr...In this paper the operation principle of the GaAs switch of the type of substrate-edge excitation is set forward, and the configuration parameters of the microstrip switch are designed. In the meantime, a method of producing short pulses laser with high peak power is presented. The experimental results show that the insertion loss of the microwave switching is less than 1dB and the isolation is up to 30dB.展开更多
文摘A novel photosensitive hybrid field-effect transistor （FET） which consists of a multiple-shell of organic porphyrin film/oxide/silicon nanowires is presented. Due to the oxide shell around the nanowires, photoswitching of the current in the hybrid nanodevices is guided by the electric field effect, induced by charge redistribution within the organic film. This principle is an alternative to a photoinduced electron injection, valid for devices relying on direct junctions between organic molecules and metals or semiconductors. The switching dynamics of the hybrid nanodevices upon violet light illumination is investigated and a strong dependence on the thickness of the porphyrin film wrapping the nanowires is found. Furthermore, the thickness of the organic films is found to be a crucial parameter also for the switching efficiency of the nanowire FET, represented by the ratio of currents under light illumination （ON） and in dark conditions （OFF）. We suggest a simple model of porphyrin film charging to explain the optoelectronic behavior of nanowire FETs mediated by organic film/oxide/semiconductor junctions.
基金the Pre-research Fund of the Commission of Science,Technology and Industry for National Defence.
文摘In this paper the operation principle of the GaAs switch of the type of substrate-edge excitation is set forward, and the configuration parameters of the microstrip switch are designed. In the meantime, a method of producing short pulses laser with high peak power is presented. The experimental results show that the insertion loss of the microwave switching is less than 1dB and the isolation is up to 30dB.
