By Sarath D. Gunapala, David R. Rhiger and Chennupati Jagadish (Eds.)
In view that its inception in 1966, the sequence of numbered volumes referred to as Semiconductors and Semimetals has amazing itself in the course of the cautious choice of famous authors, editors, and members. The "Willardson and Beer" sequence, because it is celebrated, has succeeded in publishing a variety of landmark volumes and chapters. not just did a lot of those volumes make an effect on the time in their ebook, yet they remain well-cited years after their unique unlock. lately, Professor Eicke R. Weber of the collage of California at Berkeley joined as a co-editor of the sequence. Professor Weber, a well known specialist within the box of semiconductor fabrics, will extra give a contribution to carrying on with the sequence' culture of publishing well timed, hugely appropriate, and long-impacting volumes. a few of the fresh volumes, reminiscent of Hydrogen in Semiconductors, Imperfections in III/V fabrics, Epitaxial Microstructures, High-Speed Heterostructure units, Oxygen in Silicon, and others promise that this custom may be maintained or even improved. Reflecting the really interdisciplinary nature of the sphere that the sequence covers, the volumes in Semiconductors and Semimetals were and should remain of significant curiosity to physicists, chemists, fabrics scientists, and machine engineers in smooth industry.Written and edited by way of the world over popular expertsRelevent to a large readership: physicists, chemists, fabrics scientists, and equipment engineers in academia, clinical laboratories and glossy undefined.
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Extra resources for Advances in Infrared Photodetectors
4 V. The noise spectra are relatively flat from 1 Hz to 5 kHz, showing the absence of 1/f noise in this device. The shot noise in the device increases with an increase of the applied bias/current, as can be seen clearly from the noise spectral density at frequencies higher than 1 kHz; however, the general “flatness” of the noise spectra does not change with bias, and no onset of 1/f noise is observed. In contrast, the noise characteristics are profoundly different in the device d2 (Fig. 23, top).
In order to distinguish which recombination process has the major influence on the minority carrier lifetime, PL and EL spectroscopy are used. When performing these studies, it is preferable to sandwich the absorber between two barriers to reduce the effect of surface recombination. (see suggestions by Ahrenkiel and Lundstrom, 1993). To get an understanding of the possible Auger-related processes that might limit the lifetime, the band structure of the material is studied. The band gap of the superlattice can be approximated by the peak energy of the PL (or EL) spectrum or with the cutoff wavelength of the absorption spectrum (Fig.
One of the key uses for the unipolar barrier is in the suppression of generation-recombination (G-R) dark current due to SRH processes. As discussed by Klipstein (2008), in a conventional photodiode, there exists a threshold temperature T0 , above which the dark current is diffusion limited and below which G-R limited. In a homojunction pn diode, the G-R current is proportional to exp(−Eg /2kT) (assuming mid-gap defect level) and is predominantly generated in the depletion region. If the depletion region of the pn diode is replaced by a larger gap semiconductor (a barrier), in which the exp(−Eg /2kT) factor is greatly reduced (particularly at lower temperatures), the SRH dark current generation can be virtually eliminated.