The improvements are achieved with a new pulse profile for crystallisation of amorphous silicon to nanocrystalline as reported in the April issue of Applied Physics Letters (90, 171912). Lead investigator Dr Damitha Adikaari comments: “The use of a modified laser pulse shape results in more efficient transformation of amorphous silicon into its crystalline form, with significant control of surface roughness allowing for higher degree of control of design parameters.”
The enhanced understanding of effects of the pulse profile on the texture of silicon films has allowed the investigators to fabricate efficient organic/inorganic hybrid solar cells, with the highest reported efficiency for nanocrystalline silicon and the type of polymer used (MEH-PPV). (Applied Physics letters, 90, 203514) Dr Adikaari further states that “the cells were initially fabricated to help us understand nanocrystalline inorganic/organic interfaces, made with laser textured nanocrystalline silicon and spin-cast MEH-PPV. However, they result in impressive photocurrents, where the bulk of the photo-generation is believed to be from the nanocrystalline silicon layer."
The laser texturing of amorphous silicon has also been used to prove another concept to increase the surface area of organic photovoltaics while keeping the device thickness to a minimum. In a subsequent article to be published in Applied Physics Letters, the researchers report nano-imprinted organic cells with a laser textured stamp. The lead investigator Mr Nanditha Dissanayake states “the imprinting process results in a five-fold increase in photo-current, purely due to the surface area increase which increases the collection efficiency of the photo-generated carriers.”
The Director of the ATI, Professor Ravi Silva, who also heads the Nano Electronics Centre where the work was carried out, comments: “The fundamental understanding we have gained in nano-texturing of amorphous silicon has led ATI researchers to improve charge extraction of organic/inorganic hybrid devices, which is giving rise to some exciting device physics. These nano-engineered devices promise a lot of potential for large scale organic/inorganic photovoltaics.”
Stuart Miller | alfa
APEX takes a glimpse into the heart of darkness
25.05.2018 | Max-Planck-Institut für Radioastronomie
First chip-scale broadband optical system that can sense molecules in the mid-IR
24.05.2018 | Columbia University School of Engineering and Applied Science
The more electronics steer, accelerate and brake cars, the more important it is to protect them against cyber-attacks. That is why 15 partners from industry and academia will work together over the next three years on new approaches to IT security in self-driving cars. The joint project goes by the name Security For Connected, Autonomous Cars (SecForCARs) and has funding of €7.2 million from the German Federal Ministry of Education and Research. Infineon is leading the project.
Vehicles already offer diverse communication interfaces and more and more automated functions, such as distance and lane-keeping assist systems. At the same...
A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.
The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...
At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.
At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...
There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?
At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
25.05.2018 | Event News
02.05.2018 | Event News
13.04.2018 | Event News
25.05.2018 | Event News
25.05.2018 | Machine Engineering
25.05.2018 | Life Sciences