Skip to content. | Skip to navigation

Personal tools

The Global
Information Hub for
Lighting Technologies
and Design

Sections
Home > Technologies > LEDs & OLEDs > New Options for Transparent Contact Electrodes
White Paper | Technology | Jan 30, 2013

New Options for Transparent Contact Electrodes

Found in flat screens, solar modules, or in new organic light-emitting diode (LED) displays, transparent electrodes have become ubiquitous. Typically, they consist of metal oxides like In2O3, SnO2, ZnO and TiO2 .

But since raw materials like indium are becoming more and more costly, researchers have begun to look elsewhere for alternatives. A new review article by HZB scientist Dr. Klaus Ellmer, published in the renowned scientific journal Nature Photonics, is hoping to shed light on the different advantages and disadvantages of established and new materials for use in these kinds of contact electrodes.

Metallic (Ag or Cu) or carbon based nanostructures exhibit many interesting properties that could potentially be exploited pending further research. Even graphene, a modified form of carbon, could turn out to be a suitable transparent electrode, since it is both transparent and highly conductive. These properties depend, to a large extent, on the material's composition: graphene, which consists of a single layer of carbon atoms arranged into a hexagonal "honeycomb" grid, is two-dimensional, and, within these dimensions, electrons can freely move about.

According to Ellmer, "these new kinds of materials could be combined with more conventional solutions or find their way into entirely new areas of application." For this to become a reality, researchers have yet to come up with solutions to nanostructure problems like short circuits and continue to illuminate the relevant transport mechanisms. It would also be interesting to determine whether these two-dimensional "electron gases" also form in materials other than graphene. Success ultimately depends on whether or not the new materials prove stable in the long run in their practical application and whether or not they can be produced relatively inexpensively.

Ellmer is sole author of an extensive review article published in Nature photonics online on 30. November 2012, doi: 10.1038/nphoton.2012.282

FEATURED

NICHIA LED Technology Presented at LICHTWOCHE München

NICHIA LED Technology Presented at LICHTWOCHE München LED manufacturer NICHIA, a specialist in highly efficient lighting, Human Centric Lighting and the imitation of natural light, will participate in the Munich Lichtwoche 2021 from 5 to 12 November with a light installation, two presentations and a discussion on the topic of UV-C. The light ... Read more »

EDITORIAL

deLIGHTed Talks: Good Light – Good Life in Wintertime, November 3, 2021

deLIGHTed Talks: Good Light – Good Life in Wintertime,  November 3, 2021 The Good Light Group, together with the Society for Light Treatment and Biological Rhythms (SLTBR), the Daylight Academy (DLA), the International Association of Lighting Designers (IALD), and Luger Research (LR), are organizing and presenting the “Good Light – Good Life” lectures. The webinar ... Read more »

page_peel