Download e-book for iPad: Advanced Characterization Techniques for Thin Film Solar by Daniel Abou-Ras, Thomas Kirchartz, Uwe Rau

By Daniel Abou-Ras, Thomas Kirchartz, Uwe Rau

ISBN-10: 3527410031

ISBN-13: 9783527410033

Written through scientists from prime institutes in Germany, united states and Spain who use those thoughts because the middle in their medical paintings and who've an exact inspiration of what's suitable for photovoltaic units, this article comprises concise and finished lecture-like chapters on particular learn methods.They specialise in rising, really expert strategies which are new to the sector of photovoltaics but have a confirmed relevance. even though, because new equipment must be judged based on their implications for photovoltaic units, a transparent introductory bankruptcy describes the fundamental physics of thin-film sun cells and modules, offering a advisor to the categorical benefits which are provided by way of every one person method.The collection of topics is a consultant cross-section of these equipment having fun with a excessive measure of visibility in contemporary medical literature. additionally, they take care of particular device-related subject matters and contain a range of fabric and surface/interface research equipment that experience lately confirmed their relevance. eventually, simulation innovations are provided which are used for ab-initio calculations of appropriate semiconductors and for machine simulations in 1D and 2D.For scholars in physics, strong nation physicists, fabrics scientists, PhD scholars in fabric sciences, fabrics institutes, semiconductor physicists, and people operating within the semiconductor undefined, in addition to being appropriate as supplementary studying in similar classes.

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3) simplifies to 1 ð JðVÞ ¼ q wbb ðEÞdE exp   ! 1 ð qV À1 Àq wsun ðEÞdE kT Eg ð1:4Þ Eg which is a typical diode equation with an additional photocurrent only due to the extra illumination from the sun. Now it is obvious that for zero excess illumination and zero volts applied, the current becomes zero. 2 shows the current density/voltage ( J/V) curves of an ideal solar cell according to Eq. 0 eV. If we evaluate Eq. 2. This voltage is called the open-circuit voltageVoc and follows from Eq. 4) as 01 Ð Voc ¼ kT B BEg lnB Ð q @1 Eg wsun ðEÞdE wbb ðEÞdE 1  C kT J sc;SQ C þ1 þ 1C ¼ ln A J0;SQ q ð1:5Þ Here, J0,SQ is the saturation current density in the SQ limit, that is, the smallest possible saturation current density for a semiconductor of a given band gap.

9 Current/voltage curves of (a) a p–i–n-junction solar cell and (b) a p–njunction solar cell for a constant mobility m ¼ 1 cm2/V s (for electrons and holes) and with a varying lifetime t ¼ 1 ns, 10 ns, 100 ns, 1 ms, and 10 ms. 1. An increasing lifetime helps to increase Voc in both cases up to the level defined by the surface recombination alone. In case of the p–i–n-junction solar cell, the FF increases as well. 1 Summary of all parameters for the simulations in this chapter that are not changed for the simulationa).

4 eV. By the higher Eg, parasitic absorption in the buffer layer is restricted to a much narrower range and the short circuit current density in Cd-free cells can exceed that of standard devices by up to 3 mA/cm2 [63]. However, all technological improvements rely on our scientific understanding of the physics, chemistry, and microstructure of the heterointerfaces involved in the solar cell. Surface analysis methods as those discussed in Chapters 13 and 15 have already contributed much to our present knowledge and provide the promise to deepen it further.

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Advanced Characterization Techniques for Thin Film Solar Cells by Daniel Abou-Ras, Thomas Kirchartz, Uwe Rau

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