Organic multiple quantum wells

Ohmori, Y., Fujii, A, Uchida, M., Morishima, C., and Yoshino, K., Fabrication and characteristics of 8-hydroxyquinoline aluminum/aromatic diamine organic multiple quantum well and its use for electroluminescent diode, Appl. Phys. Lett., 62, 3250-3252 (1993). 

The study of electronic processes in organic semiconducting heterostructures has been a subject of recent extensive research efforts. Of particular importance are the efforts to fabricate and study organic multiple quantum wells (OMQW s) structures, in which the charge carriers are confined in one direction to a characteristic length which is smaller than their De-Broglie wavelength. These efforts are motivated by both the... 

Y. Qiu, Y. Gao, P. Wei, and L. Wang, Organic light-emitting diodes with improved hole-electron balance by using copper phthalocyanine aromatic diamine multiple quantum wells, Appl. Phys. Lett., 80 2628-2630 (2002). 

Dimethylcadmium has found use as a volatile source of Cd for metal organic chemical vapor deposition (MOCVD) production of cadmium-containing semiconductor thin films (qv) such as CdS, Cdj Hg Te, or Cdj Mn Te, as multiple quantum well species (32). Semiconductor-grade material sells for... 

For devices the important classes of nonlinear materials are (i) molecular and polymeric materials, (ii) multiple quantum well semi-conductors, (hi) bulk semiconductors and (iv) semiconductor doped glasses. Of these classes, organic polymeric structures have shown the largest non-resonant x - Important nonlinearities observed in inorganic semiconductor materials are in a narrow wavelength region determined by excitonic resonances. Therefore, these nonlinearities are resonant, slower in response and produce thermal effects. 

With the advent of sophisticated techniques such as molecular beam epitaxy (MBE) and metal organic chemical vapor deposition (MCXTVD), synthesis of heterostructure such as multiple quantum wells or superlattices with precise interface layer down to one monolayer have been routinely possible. This not only allows modulation of electronic properties such as carrier confinement and concentration profile, but also optical confinement and wave guiding properties with appropriate choice of refractive indices of the materials. Such precise controls over the growth and material properties have opened the field of band gap engineering . 

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