New concentrator photovoltaic modules (CPV-modules) for solar power generation
Dr. Rudi Danz
The presented technology concerns new cost-effectiv CPV-modules for solar power generation and for radiation detection. The concentrator photovoltaic technology is a technology that basically makes it possible to save high-quality solar cells or detectors by the concentration of light and thereby to reduce the costs of solar power generation. It has to be considered here that optical systems for light concentration are less cost-intensive than efficient solar cells.
The technology developed consists of an array in which, acc. to Fig. 1, square, rectangular, octagonal or round solar cells and light transmitting layers for guiding solar radiation to the solar cells are applied in a chessboard-like pattern on a solar glass substrate and where said light-transmitting layers include materials which convert, through fluorescence, short-wave radiation into longer-wave radiation (down‑conversion) and/or longer-wave radiation into short-wave radiation (up‑conversion) and/or diffusely reflect the radiation and act as Lambert radiators.
Chessboard-like arrangement of solar cells 1 and light-transmitting layers 2 on a solar glass substrate, R1, R2 edges
According to Fig. 2, the light-transmitting layers consist of fluorescent materials 5 and/or diffusely reflecting materials 6 which act as Lambert radiators 6, absorbing the solar radiation 7 impinging on them, emitting it frequency-shifted and reflecting it optically isotropically or diffusely back into solar glass 3 and, due to total reflection and direct them to the solar cells 1 applied on solar glass 3.
Transmission of the solar radiation 7 to the solar cell 1 in the solar glass substrate 3 through the effect of the fluorescent and diffusely reflecting materials 5 and 6, with the solar cell 1 being applied to the substrate with an adhesive foil 4
In case of an optimum composition of the light-transmitting layers, the predominant portion of the solar radiation impinging on them is directed to the adjacent solar cells, coupled into the solar cells and leads there to a concentration of radiation. Due to this radiation concentration, the new photovoltaic modules can be equipped with a lower number of solar cells for the same electric power. Depending on application geometry and design, applying the new technology saves every tenth to fifth solar cell. Since the light transmitting layers cost only a fraction as compared to high-quality solar cells, the developed technology provides high savings potential. In particular in the case of round solar cells, much material can be saved and cutting is not necessary.
The new solar modules can be provided with a defined color spectrum (red, white, black, yellow etc.), since the light transmitting layers include colored fluorescence materials or are white reflecting. In such a way, color samples are available that can be used for advertising purposes as logos and, for instance, as national colors or for the color design of roofs and facades.
Altogether it can be estimated that, with the new technology, the module costs can be reduced by approx. 10 to 20 percent, since due to the radiation concentration fewer solar cells are required for the same electric power and the additional technological costs can be kept low.
- R. Danz, “Photovoltaik-Module zur Strahlungskonzentration“, (Photovoltaic modules for radiation concentration) international
PCT patent application of 12 March 2010, PCT/DE 2010/000274
- R.Danz, “Photovoltaik-Module zur Strahlungskonzentration“, (Photovoltaic modules for radiation concentration)
Registered German Utility Model , application of 03 June 2009, No. 20 2009 007 771.3
- Fraunhofer Institute for Applied Polymer Research in Potsdam,
- Technical University Graz, Austria
- consulting for the Federal Ministry of Education and Research, Berlin
Solar power generation, radiation detection, free space optics, light scattering measurements, solar lamps
Placing of licence
Dr. habil. Rudi Danz, physicist,
Feldfichten 46, D-14532 Kleinmachnow, Germany
e-mail: firstname.lastname@example.org ( please contact me by e-mail)