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LL1.02 - Passivation Coating on Electrospun Copper Nanowires for Stable Transparent Electrodes 
April 22, 2014   8:30am - 8:45am

Copper nanowire (CuNW) networks are one of the most promising candidates to replace indium tin oxide films as the premier transparent conducting electrode (TCEs) due to its high sheet resistance(Rs) -transmittance(T) performance, superior mechanical flexibility and low lost. However, the chemical activity of CuNWs causes a substantial increase in the Rs after thermal oxidation or chemical corrosion, which may undermine its applicability. In this work, we utilize atomic layer deposition(ALD) to coat a passivation layer onto electrospun copper nanowires and remarkably enhance their durability. The passivation layer is composed of 20-nm-thick aluminum-doped zinc oxide (AZO) for the inner layer and 1-nm-thick aluminum oxide for the outer layer. Without changing the optical transmittance, the passivated CuNW TCE shows an resistance increase of only 10% after thermal oxidation at 160 °C in dry air and 80 °C in humid air with 80% relative humidity, whereas the bare CuNWs quickly become insulating. In addition, the coating and baking of the acidic PEDOT:PSS layer increases the Rs of bare CuNW by 6 orders of magnitude, while the passivated CuNWs show an 18% increase. Our work demonstrates that this ALD method can greatly enhance the reliability of CuNW TCE and thus provide a practical solution for the degradation problem of metal nanowire TCEs.

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Keynote Address
Panel Discussion - Different Approaches to Commercializing Materials Research
Business Challenges to Starting a Materials-Based Company
Fred Kavli Distinguished Lectureship in Nanoscience
Application of In-situ X-ray Absorption, Emission and Powder Diffraction Studies in Nanomaterials Research - From the Design of an In-situ Experiment to Data Analysis