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An introduction to the physics and electrochemistry of by Maheshwar Sharon PDF

By Maheshwar Sharon

ISBN-10: 1119274338

ISBN-13: 9781119274339

ISBN-10: 1119274346

ISBN-13: 9781119274346

ISBN-10: 1119274354

ISBN-13: 9781119274353

ISBN-10: 1119274362

ISBN-13: 9781119274360

This ebook has been designed because of the author’s educating studies; scholars within the classes got here from quite a few disciplines and it was once very tough to prescribe an appropriate textbook, no longer simply because there aren't any books on those themes, yet simply because they're both too exhaustive or very elementary.  This booklet, hence, comprises basically suitable subject matters within the basics of the physics of semiconductors and of electrochemistry wanted for figuring out the intricacy of the topic of photovoltaic sunlight cells and photoelectrochemical (PEC) sunlight cells. The ebook offers the fundamental ideas of semiconductors, p:n junctions, PEC sun cells, electrochemistry of semiconductors, and photochromism.

Researchers, engineers and scholars engaged in researching/teaching PEC cells or wisdom of our sunlight, its strength, and its distribution to the earth will locate crucial subject matters corresponding to the physics of semiconductors, the electrochemistry of semiconductors, p:n junctions, Schottky junctions, the concept that of Fermi strength, and photochromism and its commercial applications.

"The issues during this publication are defined with transparent representation and necessary terminology. It covers either primary and complex themes in photoelectrochemistry and that i think that the content material awarded during this monograph could be a source within the improvement of either educational and commercial research".
—Professor Akira Fujishima, President, Tokyo college of technology, and Director, Photocatalysis overseas examine middle, Tokyo collage of technological know-how, Japan

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We should now address the next question, that is, after the compound has been formed, where do the electrons of the constituent atoms go? Would they go to the conduction band or to the valence band? Electrons, like human beings, prefer to choose the path with the least resistance. Naturally, electrons would thus occupy all the available levels of the valence band. After electrons have filled the valence band, if the system has an additional electron, it would occupy the conduction band. But in reality, there is no compound with this type of situation, except for a few metals with valence bands and conduction bands that are almost intermingled.

For every Si atom displaced to its interstitial position, one hole would be created at the lattice site, and the Si atom at the interstitial position would show an additional electron, such that the numbers of holes and electrons are equal. These numbers of holes and electrons would be present in the material no matter whether the material were intrinsic or doped. 37 and not due to added phosphorous). Thus we see the advantage of this doping. We have increased the concentration of electrons to a very large number by keeping the concentration of holes to its intrinsic value or better, say, to its equilibrium value.

But the phosphorous atom needs this electron to keep its valence condition satisfied. Thus the material is under the hide-andseek condition, so to speak. When this material is brought under a small potential, lattice sites immediately throw away the extra electron to the anode. As soon as this happens, the phosphorous atom pulls one electron from the cathode to satisfy its valence condition. Through this process of pushing and pulling of electrons, the doped material behaves like a conductor. How effectively electrons can be pulled out or pushed in depends on how freely electrons can move in the lattice.

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An introduction to the physics and electrochemistry of semiconductors: fundamentals and applications by Maheshwar Sharon

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