Nanotemplate-Enabled Arrays of Highly Heterogeneous Nanostructures for Infrared Detection and Power Generation.

摘要

This Final Technical Report summarizes the salient accomplishments under this grant which, though awarded for the period April 1, 2010 to Mar 31, 2015, fell victim to the federal government mandated Sequestration order that went into effect on March 28, 2013 and thus no funds were made available after March 31, 2013. The report thus can only provide status essentially as of summer 2013 as very little could be done without funds to provide for laboratory materials and supplies. The overall objectives of this program were to examine the fundamental aspects of the accommodation of the difference between lattice constant, chemical bonding, and crystal structure of an overlayer deposited epitaxially on structurally patterned substrate as a function of the patterned mesa lateral size, depth, and shape. In spite of such setback, the following significant goal was reached: highly lattice mismatched (approximately 3.5%) GaAs/In0.5G0.5aAs single quantum dot on <30nm GaAs mesa tops were realized with spectral emission uniformity an order of magnitude better than the typical lattice-mismatch strain-driven 3D island quantum dots that have provided randomly obtained single quantum dots for single photon emission experiments. This makes the nanotemplate-directed QD arrays well suited as the single photon emitter arrays much sought for quantum cryptography and information processing applications. Regretably, the sudden discontinuation of the grant did not allow exploration of this potential.