Advances in Imaging and Electron Physics, Vol. 147 by Peter W. Hawkes

By Peter W. Hawkes

Advances in Imaging and Electron Physics merges long-running serials-Advances in Electronics and Electron Physics and Advances in Optical and Electron Microscopy. This sequence positive factors prolonged articles at the physics of electron units (especially semiconductor devices), particle optics at low and high energies, microlithography, photograph technological know-how and electronic photograph processing, electromagnetic wave propagation, electron microscopy, and the computing tools utilized in these kinds of domain names

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In addition, other factors affect how many of the generated photons actually escape the sample (the external quantum efficiency [EQE]). 0 and the EQE is typically only a small percentage of the internal quantum efficiency, the CL signal generated in a typical experiment is very weak. This leads to the requirement of highly efficient light collection and highly sensitive detectors. The first factor that reduces EQE is internal absorption; photons emitted at some depth below the surface of the sample are absorbed by the sample with some constant α, such that the absorption follows the law I (x) = exp(−αx), I (0) (21) where x is the distance the photon traveled, I (x) is the photon intensity at distance x, and I (0) is the photon intensity at the point of generation.

01, and in this case the nonradiative recombination paths are dominant (have shorter lifetimes) over the radiative recombination paths. Although radiative lifetimes are typically not functions of temperature, but nonradiative processes are typically thermally activated with some activation energy EA , η can be shown to be a function of temperature (Yacobi and Holt, 1990) η= 1 1 + C · exp[−EA /kT ] (19) for some constant C. This implies that CL emission is much stronger at low temperature compared with higher temperatures.

Regions of the sample are the p-side, the quantum wells (QWs), the n-side, and the nonluminescent substrate (SiC). The 10-, 20-, and 30-keV curves are all normalized such that their integrated areas are 1. It is clear that the 10-keV beam scarcely excites the n-side, the 20-keV beam excites the QWs and n-side strongly, and the 30-keV beam is beginning to excite the substrate and strongly excites the n-side, but scarcely excites the p-side or QWs. The 5-keV case is omitted for clarity but would occupy only the p-side.

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