By Wolfgang Rainer Fahrner (auth.), Wolfgang Rainer Fahrner (eds.)
Amorphous Silicon/Crystalline Silicon sunlight Cells offers with a few average homes of heterojunction sun cells, similar to their historical past, 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 attracted to the topic. This e-book is helping to “fill within the blanks” on heterojunction sun cells. Readers will obtain a accomplished assessment of the rules, constructions, 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 info for Amorphous Silicon / Crystalline Silicon Heterojunction Solar Cells
Sample structure (i) For a sample with no charge collecting interfaces, the measured effective lifetime is then a combination of bulk and surface recombination Ueff ¼ Ubulk þ Usurface;front þ Usurface;back ð12Þ Dn Dn Sr;front Dns Sr;back Dns þ ¼ þ seff sbulk W W ð13Þ For a symmetrically prepared (sr,front = sr,back = sr) silicon sample of thickness W, and if the bulk lifetime is sufficiently long to allow generated carriers to reach Amorphous Silicon / Crystalline Silicon Heterojunction Solar Cells 43 both surfaces, and if sr is sufficiently low, the effective carrier lifetime is limited by the surface recombination velocity  as 1 1 2Sr ¼ þ seff sbulk w ð14Þ For good quality silicon wafers, bulk recombination sb can be neglected compared to surface recombination sr.
Up to now, the only commercially available back contact solar cell is produced by SunPower using diffused n+ and p+ contact regions. The self-aligned isolation process between the n+ and p+ regions important for the good fill factor of these cells has to be replaced by much more sophisticated procedures if n-type and p-type a-Si:H layers have to be prepared side by side. Several approaches to such IBC (Interdigitated Back Contact) solar cells with heterojunctions have been undertaken by many research group working on a-Si:H/c-Si heterojunction solar cells [95–97].
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. The introduction of carbon adds extra freedom to control the properties of the resulting material. An increasing concentration of carbon in the alloy (x) is used to widen the electronic gap between conduction and valence bands, in order to potentially increase the light efficiency of solar cells made with amorphous silicon carbide layers .
Amorphous Silicon / Crystalline Silicon Heterojunction Solar Cells by Wolfgang Rainer Fahrner (auth.), Wolfgang Rainer Fahrner (eds.)