Novel Devices ♦ news digest
The Full-Width Half-Maximum (FWHM) achieved was 36nm with tunable emission from 530 to 550nm. Potential clients are currently evaluating these TQDs.
QMC says its ability to achieve economies of scale with automated production offers supply security and dependable cost forecasting in joint ventures planning very large quantum dot product rollouts.
The company previously stated that capacity could be expanded sufficient to support the entire display industry converted to quantum dot 4K and 8K displays. According to market researcher IHS, demand for QD-LCD displays is projected to jump to 87.3 million units by 2020 as QD prices decrease and a reliable and uniform quantum dot supply is assured for large production runs.
In solar photovoltaics, Solterra Renewable Technologies, a QMC wholly owned subsidiary, calculates that one Solterra Quantum Dot Solar Cells (QDSC) Plant can be scaled up to produce 1000 Megawatts per year of printed solar cells using its own dedicated production of QMC quantum dots.
A Solterra QDSC facility would rely on low CAPEX for both the QD production as well as low startup costs for the solar cell equipment, says the company. Combined automated production of QD and QDSC allow a cost goal of under 12c per kWh, the present estimated residential electricity rate in the US.
Solterra’s goal is to establish regional or national QDSC plants entirely by the private sector, without federal subsidies, and a cost goal of under 12c per kWh.
Sheets of stapled
semiconductors could make ultra thin solar cells
Researchers combine tungsten diselenide with molybdenum disulphide to create ‘designer’ optoelectronic material
Researchers at the Vienna University of Technology have used two ultra-thin layers to create a new semiconductor structure suited for photovoltaic
Tungsten diselenide is a semiconductor which consists of three atomic layers. One layer of tungsten is sandwiched between two layers of selenium atoms. (The image shows the two semiconductor layers in the middle, connected to electrodes on either side).
When light shines on a photoactive material single electrons are removed from their original position. A positively charged hole remains, where the electron used to be. Both the electron and the hole can move freely in the material, but they only contribute to the electrical current when they are kept apart so that they cannot recombine.
To prevent recombination of electrons and holes, metallic electrodes can be used, through which the charge is sucked away - or a second material
Issue VI 2014
www.compoundsemiconductor.net 149 energy conversion.
Several months ago, Marco Furchi, Thomas Mueller, and Andreas Pospischil (pictured l-r) produced an ultra-thin layer of the photoactive crystal tungsten diselenide. Now, they have combined this semiconductor with another layer made of molybdenum disulphide, creating a material that shows potential for a new kind of solar cell technology, they say, that is extremely thin, semi-transparent, and flexible.
Two layers with different functions
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