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First you need to be thinking about the semiconductor correctly Once you assemble a semiconductor crystal you stop thinking about it in terms of individual atoms The crystal becomes a mass of nuclei and a sea of electrons, held together by a continuous eld of force Everything pretty much balances out Electrons and the lack of electrons, the holes, can be shifted around by applying a charge to the crystal Most explanations treat electron holes as if they were some kind of unparticle to be moved around What happens, though, is that the background grid of electrons shifts around and the need for electrons, the hole, ends up where the electrons aren t For the rst step, take two tiny pieces of semiconductor, one n-type and the other p-type.



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Microwave and electron cyclotron resonance CVD ( W / ECR CVD) Plasma is generated in a reactive gas mixture by a high-frequency electric field, such as generated by microwaves (Figure 233 (c)) or by electron cyclotron resonance (ECR) By using these methods, the coatings are very uniform over a large area (200 mm and more), smooth and of a high purity But the growth rate is very low, of the order of 01 m/h [40] By this process, large areas of uniform and homogeneous polycrystalline thin diamond films of a high quality can be obtained, predestined for electronic, optical and sensor applications Combustion synthesis (Oxy-acetylene torch and RF-high energy plasma torch) Combustion synthesis is another method in which the plasma is generated either by a chemical flame such as an oxygen acetylene torch, O2 C2H2 as depicted in Figure 233 (d) and Figure 233 (e) or by an HF torch (Figure 233 (f )) Both methods, chemical and physical, operate at very high temperatures, the chemical torch above 3,000 K and the plasma torches up to 8,000 K In both the cases the substrates to be coated need to be cooled When using oxygen acetylene torch, the deposition mode using a flame in the turbulent rather than in the laminar flow regime presents some advantages especially in what concerns the growth rate, which can be an order of magnitude greater In both modes, the coatings are irregular, non-homogeneous but relatively pure, depending on the purity of the gases Acetylene, C2H2, unfortunately cannot be easily cleaned economically to a high purity The growth rate can be orders of magnitude greater than obtained by other methods and is, for oxygen acetylene torch in the turbulent flame regime, typically 50 m/h





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(Contd )

The moment you bond them together they become a single crystal and electrons are free to wander between the two halves (Fig 12-9) Note that the two halves have di erent properties One has a surplus of free electrons and the other has holes where free electrons can get stuck Remember that both the free electrons and the electron holes can move around in the crystal Free electrons from the N side of the crystal wander into the P side and, if they encounter an electron hole, get stuck there Of course, as the electrons on the P side drift away from the junction, the holes appear to wander toward it and into the N side, gathering more free electrons.

Fig 233: Six methods of diamond deposition are shown here [40, 41]: (a) A hot filament reactor, (b) a schematic

of a thermal CVD reactor, (c) a microwave plasma activated CVD reactor, (d) an oxygen acetylene torch deposition of diamond, (e) flame shapes of the oxygen acetylene torch deposition of diamond [40] and (f) an HF plasma torch CVD reactor

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Every time a free electron from the N side gets stuck in the P side, the N side loses a bit of negative charge and the P side gains a bit This process continues until the forces balance and there is a strip in the n-type semiconductor where the free electrons have been removed, leaving it with a positive charge Those errant electrons are all trapped in holes in the p-type semiconductor, giving it a strip of negative charge (Fig 12-10) Overall the material is still neutral In fact, the electrons trapped in the holes are keeping the other electrons away They repulse the free electrons in the n-type side so they stay away from the barrier The positive strip is.

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