Optimized Structure Allows the Calibration of the Expanded Infrared Spectrum
Scientists at the Fraunhofer Institute for Solar Energy Systems ISE have developed a new version of reference cells for calibrating solar cells. At the institute’s calibration laboratory, a new cell type based on negative, conductive silicon material (n-type), was incorporated while the structure of the reference cell was optimized.
Fraunhofer ISE’s new reference cell was developed according to the international standards of the World PV Scale (WPVS).
© Fraunhofer ISE
For the calibration of different types of solar cells, the reference cell’s spectral response can be accurately adjusted using optical filters, thereby significantly reducing any measurement uncertainty.
The new version of the reference cells meets all international standards (World PV Scale and IEC 60904-2). The new cells will allow test laboratories and cell and module manufacturers in particular to significantly improve the quality of their measurements. The outdoor version of the cell also makes it possible to take exact measurements of solar insolation in the field.
The more accurately the irradiation can be measured, the more accurately the performance of PV systems can be determined. For many years, Fraunhofer ISE’s calibration laboratories – CalLab PV Cells and CalLab PV Modules – have been measuring various types of solar cells and PV modules for international customers pursuant to international norms.
Fraunhofer ISE also offers globally recognized services for yield forecasting and monitoring PV systems. Over the past 15 years, advances have been made in the development of reference cells for indoor and outdoor measurements, and technical consulting services for customers such as test laboratories and plant operators, has been expanded.
With their most recent development success, the Freiburg scientists have been able to further improve their already well-established reference cells, and bring to the market a new version of reference cells which meet the World PV Scale Standard (WPVS).
“For our new version of the WPVS reference cells, we’ve completely changed the interior structure,” says Stefan Brachmann of Fraunhofer ISE. “The reference cells were optimized with respect to linearity, stability, homogeneity, and durability.” For the first time, the Freiburg researchers incorporated a silicon solar cell made of n-type material, which allows for a significant expansion of the spectral response (see chart) in comparison to the p-type reference cells, which are still available.
The new reference cells are therefore particularly suited for the calibration of new solar cells and modules that are also n-type based and have better spectral response than the traditional p-type based reference cells. The thermal coupling of the cell and housing was also improved, reducing the temperature gradient between the solar cell and the housing of the reference cell.
In combination with optical filters, the new reference cells can be adjusted for the calibration of various solar cell technologies. The specific recommendation for use is available on the institute’s website https://www.ise.fraunhofer.de/en/service-units/callab-pv-cells-callab-pv-modules....
Teams in the areas of solar cell development and calibration worked together at Fraunhofer ISE to make the new version of the WPVS reference cells a reality. N-type solar cells are being both produced and calibrated under one roof. As the integration into housing will be carried out by long-standing suppliers, the entire manufacturing cycle of the reference cells can be traced.
This process increases the reliability and quality of the products. In addition to the calibration laboratories CalLab PV Cells and CalLab PV Modules, scientists at Fraunhofer ISE specializing in the development and characterization of solar cells, especially material and cell analysis, were also involved in realizing the new version of the WPVS reference cells.
Karin Schneider | Fraunhofer-Institut für Solare Energiesysteme ISE
OU-led team discovers rare, newborn tri-star system using ALMA
27.10.2016 | University of Oklahoma
First results of NSTX-U research operations
26.10.2016 | DOE/Princeton Plasma Physics Laboratory
Ultrafast lasers have introduced new possibilities in engraving ultrafine structures, and scientists are now also investigating how to use them to etch microstructures into thin glass. There are possible applications in analytics (lab on a chip) and especially in electronics and the consumer sector, where great interest has been shown.
This new method was born of a surprising phenomenon: irradiating glass in a particular way with an ultrafast laser has the effect of making the glass up to a...
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
27.10.2016 | Materials Sciences
27.10.2016 | Physics and Astronomy
27.10.2016 | Life Sciences