Photonic Devices Based on Surface and Composition-Engineered Infrared Colloidal Nanocrystals.

摘要

The goal of the ARO sponsored project is to develop advanced photonic devices based on surface and composition engineered semiconductor nanocrystals. The PI's laboratory has successfully carried out and exceeded the proposed goals of the project with a series of scientific findings and promising technical results. These achievements can be categorized into two major groups. The first group consists of advances in semiconductor nanocrystal- based photovoltaic technology, including thin film solar cells, luminescent solar concentrators, and photonic absorbers, while the second group is composed of accomplishments in nanocrystal light-emitting-diodes (LEDs), nanolasers, and silicon germanium emitters. Among these achievements are the first demonstration of PbSe nanocrystal photovoltaic devices and planar-mixed heterojunction quantum dot solar cells, the first observation of two-photon absorption induced lasing in semiconductor nanocrystals, the design and fabrication of the first photonic crystalenhanced nanocrystals infrared LED, the first Monte Carlo simulation of infrared luminescent solar concentrator using nanocrystals fluorophores, and the first demonstration of efficient near- band-edge electroluminescence emission from heavy-metal-free semiconductor nanoparticles. These findings and technical results open up new avenues to developing high-performance, environmentally-friend and mass-producible photonic devices with state-of-the-art colloidal semiconductor technology.