By Wolfgang Rainer Fahrner (auth.), Wolfgang Rainer Fahrner (eds.)
Amorphous Silicon/Crystalline Silicon sunlight Cells bargains with a few usual houses of heterojunction sun cells, reminiscent of their heritage, the houses and the demanding situations of the cells, a few vital measurementtools, a few simulation courses and a short survey of the cutting-edge, aiming to supply an preliminary framework during this box and function a prepared reference for all these drawn to the topic. This booklet is helping to “fill within the blanks” on heterojunction sunlight cells. Readers will obtain a complete evaluation of the rules, buildings, processing thoughts and the present developmental states of the units.
Prof. Dr. Wolfgang R. Fahrner is a professor on the collage of Hagen, Germany and Nanchang collage, China.
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Extra resources for Amorphous Silicon / Crystalline Silicon Heterojunction Solar Cells
The effective carrier lifetime at different carrier densities is determined via seff = -Dn/(dDn/dt). Figure 35 illustrates a schematic of the used setup for QSSPC and TPCD measurements. 46 W. R. Fahrner Combining the Two Measurement Modi Evaluating the measured effective lifetime over the widest possible range of the excess carrier density (ECD), measurements of QSSPC/TPCD data analyzed in the corresponding QSS, generalized, or transient mode, are combined. After Kerr and Cuevas, the strength in using both QSSPC and TPCD methods to determine the effective carrier lifetime is that while the two methods are complementary, they also have different dependencies on the system calibration constants.
Results on the influence of those films compared to standard a-Si:H by Mueller et al. can be found in . Amorphous Silicon / Crystalline Silicon Heterojunction Solar Cells 37 It is found that the fraction of microcrystallinity can be varied as a function of hydrogen dilution. Low hydrogen dilution results in a larger fraction of amorphous structures inside the deposited film, whereas high H2 dilution ([98 %) results in a more microcrystalline character. 1 X cm) at optimal PECV deposition parameters.
Nevertheless, photon absorption in the emitter of a heterojunction solar cell leads to a considerable current loss with increasing a-Si:H layer thickness due to the high recombination in this layer. To improve Jsc in a-Si:H/c-Si solar cells further, it is preferable to employ an a-Si:H-based alloy that has larger optical bandgap than a-Si:H to suppress light absorption in the window layer or to reduce the recombination. Amorphous alloys of silicon and carbon (a-SixC1-x:Hy) are a promising alternative to standard a-Si:H.
Amorphous Silicon / Crystalline Silicon Heterojunction Solar Cells by Wolfgang Rainer Fahrner (auth.), Wolfgang Rainer Fahrner (eds.)