A tunable infrared laser system for the selective processing of organic layers in opto-electronical components is the goal of the new research project IMPROV, which started in September, 2010. The EU has provided approximately 2.4 million Euros support from the 7th Framework Programme for the project, which will run until 2013. The Laser Zentrum Hannover e.V. (LZH) is coordinator of the project consortium, with seven partners from science and industry.
Organic photovoltaic solar cells (OSC) are made of thin layers of different photo-active polymer films. In order to produce a functional component, these layers must be, among other things, selectively structured. The UV lasers presently used for this process are not precise enough, which often leads to a 20% loss of the active area. With a new laser process – resonant infrared ablation, or RIA for short – this production step can be significantly improved. Due to the different absorption bands of each individual polymer film, RIA can be used for selective cutting, structuring or material removal within the whole layer system. In order to achieve this, a short pulsed laser in the infrared wavelength is used, which can be tuned exactly to the best suitable maximum absorption of the layers to be processed.
This is where the EU project IMPROV „Integrated Mid-infrared high Power source for Resonant ablation of Organic based photovoltaic devices“ comes in, in which a widely tunable, infrared short pulsed laser in the wavelength spectrum between 3 and 10 m is being developed. In order to achieve this, frequency conversion of a 2° µm system in an innovative, non-linear crystal (orientation-patterned gallium arsenide) is necessary.
The market potential for plastic micro-processing applications is enormous. The planned laser system could greatly simplify production process and significantly decrease area losses, especially for organic photovoltaics, (OPV), but also for organic light emitting diodes (OLED) and organic thin-film transistors (OTFT).
Dr. Dieter Wandt, head of the Ultrafast Photonics Group of the LZH, is the IMPROV coordinator. In this project, his group is responsible for developing a completely fiber-based, mode-coupled, ultra-short pulsed thulium fiber laser with tunable output radiation in the wavelength range of 2 µm. Additionally, the typical repetition rate of 40 to 60 MHz must be reduced to 1 MHz. The other partners from Belgium, Denmark and France will amplify the laser output in further thulium-doted fibers, and then convert the laser radiation to the infrared spectral range in optical parameter generators/amplifiers based on GaAs crystals
Dieter Wandt is conscious of with the difficulty facing the LZH. "There is hardly any research on 2µm thulium-based ultra-short pulse fiber lasers, and commercial optical components are nearly non-existent. Also, due to the wavelength range, there are no laser viewers." Nevertheless, the physicist is confident, since the LZH has already gathered experience with this kind of oscillator. Also, the LZH can make some of the fiber-based key components such as pump-light couplers, outcouplers, and filters themselves.
Project partners in IMPROV are, apart from the German firms BATOP und Heliatek, the Interuniversitair MicroeIectronica Centrum VZW (IMEC), as well as Multitel ASBL, NKT Photonics and Thales. Together they form the complete process chain, from development to industrial exploitation. Experiments using the laser system for the production of organic solar cells will be carried with the help of the the Heliatek GmbH in Dresden. Interest in the compact IR high-powered laser has also been shown by the plastic processing industry, where the excimer laser is usually used.Contact:
Michael Botts | Laser Zentrum Hannover e.V.
New material could lead to erasable and rewriteable optical chips
07.12.2016 | University of Texas at Austin
Porous crystalline materials: TU Graz researcher shows method for controlled growth
07.12.2016 | Technische Universität Graz
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
07.12.2016 | Health and Medicine
07.12.2016 | Life Sciences
07.12.2016 | Health and Medicine