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The main disadvantage of silicon thin-film technology is known to be its relatively low efficiency. By comparing not only the efficiency under standard test conditions but also the behavior under real outdoor conditions the following paper presents the high potential of four-terminal structure over standard two-terminal tandem module to substantially improve the yield in kWh/kWp. Under standard test...
The combination of high frequency, high power, high efficiency capabilities is a feature of vacuum tube technology. For most of applications, large bandwidths are required, and therefore the modulation method should also allow large bandwidth operation. Optically modulated cold cathodes, avoiding the use of resonant cavities, should satisfy this requirement. This is the reason why we have developed...
Cold cathodes based on carbon nanotubes allow to produce a modulated electron beam. Using an array of vertically aligned CNs that exhibit an aspect ratio of about 200, we demonstrated the modulation of a high current density beam (~ 1 A/cm2 at 1.5 and 32 GHz frequencies. Such CN cathodes are very promising for their use in a new generation of compact, highly efficient and low cost amplifiers that...
We have demonstrated for the first time a beam modulation at 1.5 GHz (Teo, et. al., 2005). However, the use of resonant cavities leads to narrow bandwidth operation. To overcome this limitation we propose an optical control of the electron beam modulation thanks to a novel photocathode, which integrates CNTs with photodiodes.
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