Next-generation antireflection coatings could improve solar photovoltaic cell efficiency

Materials boasting a “tunable” refractive index have been developed within the past few years, and they show tremendous potential for photovoltaic applications. Professor E. Fred Schubert, of Rensselaer Polytechnic Institute's Department of Electrical, Computer, and Systems Engineering, is investigating ways to exploit this newly gained controllability and will present his findings at the upcoming AVS 59th International Symposium and Exhibition, held Oct. 28 – Nov. 2, in Tampa, Fla.

The refractive index is the property of a material that changes the speed of light, and is computed as the ratio of the speed of light in a vacuum to the speed of light through the material. Among the most fundamental properties of optical materials, the refractive index determines important optical characteristics such as Fresnel reflection, Bragg reflection, Snell refraction, diffraction, and the phase and group velocity of light.

Air and other gases have a refractive index very close to 1.0, but unfortunately aren't viable for thin-film optoelectronic applications. Among transparent dense materials suitable for use in thin-film optoelectronic applications, magnesium fluoride (MgF2) has the lowest refractive index (n=1.39); no dense materials with a lower refractive index are known to exist.

In fact, for many years the range between 1.0 and 1.39 remained unexplored. But with the advent of tunable-refractive-index materials, that's changing. Schubert's research is based on tailoring transparent thin-film materials whose refractive index can be controlled.

“Optical thin-film materials with a refractive index as low as 1.05 have been demonstrated. Tunable-refractive-index materials are based on 'nanoporous' silicon dioxide (SiO2), indium-tin oxide (ITO), and titanium dioxide (TiO2), and we can precisely control porosity by using oblique-angle deposition – a technique in which the substrate is at non-normal angle of incidence with respect to the deposition source,” says Schubert.

Schubert and colleagues used these materials to design and fabricate a four-layer antireflection coating. “The fabrication process of this coating is additive and purely physical, so it's fully compatible with current manufacturing processes of solar cells,” he notes. “Our customizable approach readily lends itself to the incorporation of antireflection coating design into solar cell device structures for application-specific requirements.”

This four-layer antireflection coating is viable, readily applicable, and shows great promise for future generations of antireflection coating technology on solar cell devices.

MORE INFORMATION ABOUT THE AVS 59th INTERNATIONAL SYMPOSIUM & EXHIBITION

The Tampa Convention Center is located along the Riverwalk in the heart of downtown Tampa at 333 S. Franklin St., Tampa, Florida, 33602.

USEFUL LINKS:

Main meeting website: http://www2.avs.org/symposium/AVS59/pages/greetings.html

Technical Program: http://www.avssymposium.org/

Housing and Travel Information: http://www2.avs.org/symposium/AVS59/pages/housing_travel.html

PRESS REGISTRATION

The AVS Pressroom will be located in the Tampa Convention Center. Your complimentary media badge will allow you to utilize the pressroom to write, interview, collect new product releases, review material, or just relax. The media badge will also admit you, free of charge, into the exhibit area, lectures, and technical sessions, as well as the Welcome Mixer on Monday evening and the Awards Ceremony and Reception on Wednesday night. Pressroom hours are Monday-Thursday, 8-5 p.m.

To register, please contact:

Della Miller, AVS
E-mail: della@avs.org
This news release was prepared for AVS by the American Institute of Physics (AIP).

ABOUT AVS

Founded in 1953, AVS is a not-for-profit professional society that promotes communication between academia, government laboratories, and industry for the purpose of sharing research and development findings over a broad range of technologically relevant topics. Its symposia and journals provide an important forum for the dissemination of information in many areas of science and technology, enabling a critical gateway for the rapid insertion of scientific breakthroughs into manufacturing realities.

Media Contact

Catherine Meyers EurekAlert!

More Information:

http://www.aip.org

All latest news from the category: Process Engineering

This special field revolves around processes for modifying material properties (milling, cooling), composition (filtration, distillation) and type (oxidation, hydration).

Valuable information is available on a broad range of technologies including material separation, laser processes, measuring techniques and robot engineering in addition to testing methods and coating and materials analysis processes.

Back to home

Comments (0)

Write a comment

Newest articles

Lighting up the future

New multidisciplinary research from the University of St Andrews could lead to more efficient televisions, computer screens and lighting. Researchers at the Organic Semiconductor Centre in the School of Physics and…

Researchers crack sugarcane’s complex genetic code

Sweet success: Scientists created a highly accurate reference genome for one of the most important modern crops and found a rare example of how genes confer disease resistance in plants….

Evolution of the most powerful ocean current on Earth

The Antarctic Circumpolar Current plays an important part in global overturning circulation, the exchange of heat and CO2 between the ocean and atmosphere, and the stability of Antarctica’s ice sheets….

Partners & Sponsors