Technion-Israel Institute of Technology researchers have now found a new way to generate an electrical field inside the quantum dots, making them more suitable for building an energy-efficient nanocrystal solar cell.
In their report in the October 9 issue of Nature Materials, Professor Nir Tessler (of the Zisapel Nano-Electronics Center in the Technion Department of Electrical Engineering) and colleagues describe how they "tuned" the electrical properties of quantum dots before testing their capabilities in a model solar cell.
Nanocrystal or quantum dots "are promising materials for low-cost and high efficiency solar cells" due to their unusual electronic properties, Tessler said. For instance, the size of a quantum dot is uniquely correlated to its light absorption, so changing a dot's size can maximize its ability to harvest light within a solar cell.
To live up to their promise, however, the dots must share electrons efficiently-a feat that has been difficult to control. The Technion study offers a new way to bring an electrical charge to the dots-each about one-millionth the size of the period at the end of this sentence.
Tessler and colleagues were able to generate strong electrical fields within the dots by capping them with two different organic molecules. The chemical groups that attach the molecules to the dots' surface generate the electrical field, they show.
Tessler said the findings give researchers one more method of controlling the building blocks of nanoelectronics. The dots are produced in an optoelectronic "ink" solution, he noted, which could make them suitable for future applications in "the field of printed electronics that will produce sheets of light or sheets of solar cells."
The researchers hope to combine these findings along with their previous experiments that mix different kinds of nanocrystals, to discover whether combining the two methods might lead to even more efficient energy production.
The Technion-Israel Institute of Technology is consistently ranked among the world's leading science and technology universities. Home to three of Israel's five winners of the Nobel Prize in science, the Technion commands a worldwide reputation for its pioneering work in computer science, nanotechnology, biotechnology, energy, water-resource management, medicine, drug development, and aerospace. Headquartered in New York City, the American Technion Society (ATS) promotes scientific and technological research and education at the Technion.
Kevin Hattori | Newswise Science News
A new tool for discovering nanoporous materials
23.05.2017 | Ecole Polytechnique Fédérale de Lausanne
Did you know that packaging is becoming intelligent through flash systems?
23.05.2017 | Heraeus Noblelight GmbH
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
26.05.2017 | Life Sciences
26.05.2017 | Life Sciences
26.05.2017 | Physics and Astronomy