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High concentration PV systems usually prefer tandem III-V cells to Si cells, due to the much lower conversion efficiency of the latter. We re-examine the efficiency achievable with Si Vertical Multi-Junction (VMJ) cells consisting of series-connected vertical p-n junctions within a single cell. A comprehensive 2D numerical analysis of a Si vertical junction has been performed, over a wide range of...
Abstract.Applying current data on cell differentia- tion and meiosis control to the early sporangial development in angiosperms, a strict relationship between cell lineage and its differentiation fate is rejected. An evaluation of cytological features indicative of a meiotic (sporogenous) fate discards the sterilization phenomenon and introduces the premeiotic cellular differentiation (PCD) concept...
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