By Roland Scheer
This primary finished description of an important fabric homes and gadget features closes the space among common books on sunlight cells and magazine articles on chalcogenide-based photovoltaics.Written through very popular authors with years of functional event within the box, the publication covers II-VI and I-III-VI2 fabrics in addition to power conversion at heterojunctions. It additionally discusses the newest semiconductor heterojunction versions and provides sleek research ideas. skinny movie know-how is defined with an emphasis on present and destiny thoughts for mass construction, and the booklet closes with a compendium of failure research in photovoltaic skinny movie modules.With its review of the semiconductor physics and expertise wanted, this sensible booklet is perfect for college students, researchers, and brands, in addition to for the growing to be variety of engineers and researchers operating in businesses and institutes on chalcogenide photovoltaics.
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Additional info for Chalcogenide Photovoltaics: Physics, Technologies, and Thin Film Devices
Sample text
Jn and Jp are dependent on z but Jdiode is independent of z. 16 (a) Schematic presentation of the most critical recombination paths in a heterostructure solar cell. Recombination (1) at the absorber surface, (2) in the absorber bulk, (3) at the absorber back contact, and (4) in the absorber space charge region. Also, a recombination path in the buffer layer is indicated (5). (b) Sketch of tunneling enhanced recombination (1∗ ) for interface and (4∗ ) SCR recombination. By tunneling, the density of holes which contribute to a particular recombination path may be increased.
Although recombination processes determine the diode current of the cell, we speak of diode current and not of recombination current. The reason is that recombination also reduces the photo current. 9. The motivation behind this discrimination is to apply the superposition principle wherever possible. Other expressions for the diode current are bucking current or reverse current. 1 Superposition Principle and Shifting Approximation If the solar cell is voltage biased in the dark, a pure diode current is flowing.
As pointed out by Franciosi and van de Walle [20], isovalent interfaces are difficult to engineer and only small deviations from the canonical band line up are to be expected. 3. A dipole with negative charge at the buffer side and positive charge at the absorber side would increase the value of Ec . Thereby, a type II interface could be inverted to a type I interface. 6 Deep Bulk States The semiconductors of our heterostructure may contain defect states within the bandgap. If the defect states become charged, they add to the space charge of the heterostructure, similar as interface states.