Properties of Impurity States in Superlattice Semiconductors by A. Zrenner, F. Koch (auth.), C. Y. Fong, Inder P. Batra, S.

By A. Zrenner, F. Koch (auth.), C. Y. Fong, Inder P. Batra, S. Ciraci (eds.)

A NATO workshop on "The houses of Impurity States in Semiconductor Superlattices" used to be held on the college of Essex, Colchester, uk, from September 7 to eleven, 1987. Doped semiconductor superlattices not just supply a different chance for learning low dimensional digital habit, they could even be custom-designed to express many different attention-grabbing el~ctronic houses. the potential of utilizing those fabrics for brand new and novel units has extra brought on many amazing advances, in particular lately. the aim of this workshop was once to check either advances within the cutting-edge and up to date leads to quite a few parts of semiconductor superlattice study, together with: (i) development and characterization strategies, (ii) deep and shallow im­ purity states, (iii) quantum good states, and (iv) two-dimensional conduction and different novel digital houses. This quantity contains the entire papers awarded on the workshop. Chapters 1-6 are involved in development and characterization thoughts for superlattice semiconductors. The query of a-layer is usually mentioned during this part. Chapters 7-15 include a dialogue of assorted features of the impurity states. Chapters sixteen- 22 are dedicated to quantum good states. ultimately, two-dimensional conduction and different digital houses are defined in chapters 23-26.

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49 LP-MOCVD IGalnAs-lnPI SL a LP-MOCVD IGalnAs-lnPI SL ",. t;. -- T ,.. • .. ' ' 1 If' ,~, ... ~ ;... - .... b Fig. 7. r'-- ,- it --..... 53As/lnp superlattice 7-b 50 --- Dark field image at atomic resolution of the same super lattice LP-MOCVD nO 640 Fig. 53As/lnP superlattice grown by automatic MOCVD reactor. 51 Optical Properties The quantum size effect appears when the size of the sample is small compared with the intrinsic quantum length scale associated with carriers in the semiconductor. This is given by the de Broglie wavelength A = h/p, where h is Planck's constant and p the carrier momentum, typically given by p2/2m* = kBT, kB being the Boltzmann constant.

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01As alloy. In addition, we have discussed an impurity incorporation model consistent with our experimental observations. 01As heterojunction bipolar transistors were fabricated and their dc behavior was discussed in view of the anomalous dopant quantity present in the base. Based on minority carrier diffusion length measurements, we have shown the interest, as now confirmed by experimental results, of very high doping levels in order to increase the maximum oscillation frequency of the device.

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