Quantum Engineering Research Paper on “Transparent Electrodes” One of Top 20 Downloads from the Journal Nano Letters

A journal article by PQI researchers investigating the properties of copper nanomeshes to form transparent electrodes was one of the Top 20 articles downloaded from the journal Nano Letters web site in April 2014. 

The team is led by principle investigator and PQI faculty Paul W. Leu, PhD, and Co-PIs include PQI faculty Jung-Kun Lee, PhD, and research assistants Bo Ding, Tongchuan Gao, and Baomin Wang. The article, "Uniform and Ordered Copper Nanomeshes by Microsphere Lithography for Transparent Electrodes," was published in Nano Letters.

According to the article, transparent conductors are important as the top electrode for optoelectronic devices such as solar cells, flat panel displays, touch screens and light-emitting diodes. Manufacturers currently use indium tin oxide to build transparent conductors, but indium is an expensive and brittle rare earth metal, limiting its use. While researchers have investigated other materials such as grapheme and silver, the Pitt group is focusing on copper because of its relative abundance and low cost. Their research includes simulation and experimental investigation of copper nanomeshes with holes arranged in a hexagonal lattice in a Cu thin film. 

"Random metal nanowire meshes suffer from non-uniform sheet resistance, haziness due to scattering, and high contact resistance especially for copper which tends to oxidize." Dr. Leu explains. "Our metal nanomesh structure provides more uniform resistance on the microscale, less scattering, and does not have nanowire-nanowire contacts. The nanomeshes can be fabricated directly on rigid substrates like quartz or flexible materials like plastics." 

Read the original article here.