Read e-book online Advances in Electronics and Electron Physics, Vol. 86 PDF

By Peter W. Hawkes (ed.)

ISBN-10: 0120147289

ISBN-13: 9780120147281

This sequence covers quite a lot of subject matters, stretching from the particle optics of accelerators, mass spectrometers, electron and ion microscopes, and of person elements of those tools to theoretical and functional elements of contemporary electroinics. one other large intterest is electronic picture processing and trend acceptance, together with the units hired and the tools built. Electron physics is interpreted very liberally and articles are usually integrated on fabrics of present curiosity in addition to at the units that hire them. the article of the sequence is to supply articles which can overview a brand new or swiftly constructing box, or may well conceal a long time of analysis, therefore offering a small monograph on a selected topic. "Advances in Electronics and Electron Physics" quantity 86 good points articles at the following issues: GaAs semiconductor thoughts; picture processing; N-beam calculators; and electron optics.

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Extra resources for Advances in Electronics and Electron Physics, Vol. 86

Example text

41. Here we see that storage times of tens of seconds are obtained at 100 K, and measurable charge storage persists to almost 200 K. Again, however, room temperature operation is not feasible. In addition to questions of storage time, we must also consider the charge storage density of heterojunction DRAM cells. The hole memory capacitor of Fig. 41 can retain about 8 x 10" holes per cm2at 150 K, while the electron capacitor of Fig. 38 retains only about 1 x 10" electrons per cm2at 80 K. In order to store lo6 carriers, the hole capacitor would need to be at least 1 1 x 11pm2, while the electron capacitor would need to be at least 32 x 32 pm2.

By this criterion, Fig. 14 indicates that both these (unoptimized) pnp storage capacitors would be capable of satisfactory operation to over 100°C. 2. Effect of Doping Equation (33) indicates that the charge storage time constant T~ is expected to scale directly with doping. This is because higher dopings result in smaller depletion regions, and generation within the depletion region determines the storage time. , the charge stored per unit area at a given voltage, increases as the square root of doping.

The mathematics involved are straightforward but tedious (Dungan, 1989) and will not be reproduced here. However, an example of such a calculation is shown in Fig. 10. Here we plot the normalized capacitance recovery transient for two pulse voltages and three generation center positions. All six curves are calculated assuming that the (A/ effective generation current per unit volume in the depletion region, Jeff cm’), is equal to unity. 05 3, FIGURE10. Normalized capacitance recovery transients for a nonsymmetrical pnp capacitor ( N A ,= NA2= 1 x 10’8cm-3,ND = 1 x l O ” ~ m - ~for ) two pulse voltages and three generation center energies.

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Advances in Electronics and Electron Physics, Vol. 86 by Peter W. Hawkes (ed.)


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