New Alloys and Heterostructures for II-VI Visible Semiconductor Lasers and Devices

9320415 Tamargo这项建议是为了生长和表征新型三元和四元II-VI化合物半导体和异质结构，这些半导体和异质结构将提供设计实用可见光发射器所需的一系列独特性能。目前，基于锌镉镉/硒锌异质结的蓝绿激光器已经初具规模。三元是带隙较小的材料或井。然而，这两种材料之间的非理想能带偏移以及由于II-VI结构内的晶格失配以及与衬底的缺陷限制了器件的性能。在III-V技术中，有可能将二元II-VI化合物组合成三元和四元合金，从而将材料的能带结构和晶格常数调整到所需的水平。这些II-VI混合合金很少被生长和研究。它将通过更多材料表征的几次合作得到增强。使用这些具有更有前途的特性的异质结构的简单器件也将被研究。***

9320415 Tamargo This proposal is for the growth and characterization of novel ternary and quaternary II-VI compound semiconductors and heterostructures that will provide a range of unique properties needed for the design of practical visible light emitters. At present, rudimentary blue-green lasers based on ZnCdSe/ZnSe heterostructures have been demonstrated. The ternary is the small bandgap material or well. However, non-ideal band offsets between those two materials and defects due to lattice mismatch within the II-VI structure and with the substrate limit the performance of the device. As in III-V technology, it is possible to combine binary II-VI compounds to form ternary and quaternary alloys and thus adjust the band structure ad lattice constant of the materials to those desired. Very few of these II-VI mixed alloys have been grown and investigated. It will be enhanced through several collaborations for additional materials characterization. Simple devices using those heterostructures which posses more promising properties, will also be investigated. ***