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
Only an atom thick: Physicists succeed in measuring mechanical properties of 2D monolayer materials
17.01.2018 | Universität des Saarlandes
Black hole spin cranks-up radio volume
15.01.2018 | National Institutes of Natural Sciences
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.
Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...
The oceans are the largest global heat reservoir. As a result of man-made global warming, the temperature in the global climate system increases; around 90% of...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
18.01.2018 | Life Sciences
18.01.2018 | Life Sciences
18.01.2018 | Earth Sciences