High-voltage GaAs photovoltaic laser power converters (2009)
Schubert, J., Oliva, E., Dimroth, F., Guter, W., Löckenhoff, R., Bett, A.W.
The main drawback of photovoltaic (PV) laser power converters based on GaAs material is the low output voltage, which is often insufficient to power electronic circuits directly. Aside from the use...
Increasing the efficiency of fluorescent concentrator systems (2009)
Goldschmidt, J.C., Peters, M., Bösch, A., Helmers, H., Dimroth, F., Glunz, S.W., ...
This study examines concepts for increasing the efficiency of fluorescent concentrator systems. Different system sizes and configurations are investigated in detail by external quantum efficiency...
Guter, W., Schöne, J., Philipps, S.P., Steiner, M., Siefer, G., Wekkeli, A., ...
A metamorphic Ga0.35In0.65P/Ga0.83In0.17As/Ge triple-junction solar cell is shown to provide current-matching of all three subcells and thus composes a device structure with virtually ideal band gap...
Löckenhoff, R., Dimroth, F., Oliva, E., Ohm, A., Wilde, J., Faiman, D., ...
Monolithic interconnected modules (MIMs) are large area, high voltage PV devices which perform well at very high light intensities. They are therefore well suited for the assembly of dense array...
Misfit dislocation blocking by dilute nitride intermediate layers (2008)
Schöne, J., Spiecker, E., Dimroth, F., Bett, A.W., Jäger, W.
Optimization of annealing conditions of (GaIn)(NAs) for solar cell applications (2008)
Volz, K., Lackner, D., Nemeth, I., Kunert, B., Stolz, W., Baur, C., ...
Calibrated numerical model of a GaInP-GaAs dual-junction solar cell (2008)
Philipps, S.P., Hermle, M., Letay, G., Dimroth, F., George, B.M., Bett, A.W.
In this letter a calibrated numerical model of a III-V dualjunction solar cell including tunnel diode and Bragg reflector is presented. The quantum efficiencies of the subcells are computed by using...
Memory effect of Ge in III-V semiconductors (2008)
Welser, E., Guter, W., Wekkeli, A., Dimroth, F.
Epitaxial growth of germanium is attractive for Ge/III-V hetero devices Such as multi-junction solar cells. We investigated the growth of Ge with iso-butyl germane (IBGe) as germanium source and...
III-V solar cells under monochromatic illumination (2008)
Bett, A.W., Dimroth, F., Löckenhoff, R., Oliva, E., Schubert, J.
Photovoltaic cells illuminated with a monochromatic light source have revealed the highest ever reported photon-energy conversion efficiency. In this paper we investigate laser illuminated...
Doping electrical properties and solar cell application of GaInNAs (2008)
Volz, K., Stolz, W., Teubert, J., Klar, P.J., Heimbrodt, W., Dimroth, F., ...
Life cycle assessment of the concentrating photovoltaic system FLATCON. (2008)
Matzer, R., Peharz, G., Patyk, A., Dimroth, F., Bett, A.W.
Advances in Energy Studies 2008 : Towards an Holistic Approach Based on Science and Humanity ; Workshop, Graz, A, June 29 - July 2, 2008
Vorrichtung und Verfahren zur photovoltaischen Erzeugung von Wasserstoff (2007)
DE1004050638 B UPAB: 20060302 NOVELTY - A photovoltaic process and assembly release hydrogen from substances e.g. deionised water containing hydrogen atoms. In the process solar energy is focused on...
Effects of optical coupling in III-V multilayer systems (2007)
Baur, C., Hermle, M., Dimroth, F., Bett, A.W.
A method to visualize and investigate radiative recombination processes in compound semiconductor materials by utilizing the effect of optical coupling in III-V multilayer systems is presented. For...
Solarzellenmodul und Verfahren zu seiner Herstellung (2007)
Jaus, J., Bett, A., Boesch, A., Dimroth, F., Lerchenmueller, H.
DE 102005035672 A1 UPAB: 20070402 NOVELTY - A number of electrical solar energy ells (5a,b,c) are formed on a copper substrate (19c) that is formed in sections on an insulating base substrate (18c)....
Photovoltaisches Konzentratormodul mit Multifunktionsrahmen (2007)
Dimroth, F., Bett, A., Schmidt, C., Lerchenmueller, H.
WO 2007093422 A1 UPAB: 20071024 NOVELTY - The concentrator module has a multifunction frame. The concentrator module has a lens plate (1) and a base plate (2) between which circulates a frame (3)....
Material development for improved 1 eV (Galn)(NAs) solar cell structures (2007)
Volz, K., Torunski, T., Lackner, D., Rubel, O., Stolz, W., Baur, C., ...
The dilute nitride (GaIn)(NAs) material system grown lattice matched to GaAs or Ge with a 1 eV band gap is an interesting material for the use in four-junction solar cells with increased...
Triple-junction III-V based concentrator solar cells: Perspectives and challenges (2007)
Baur, C., Bett, A.W., Dimroth, F., Siefer, G., Meusel, M., Bensch, W., ...
This paper gives a review of the work performed in the framework of the EC-funded project FULLSPECTRUM aiming for higher photovoltaic (PV) conversion efficiencies by investigating GaInP/GaInAs/Ge...
Advanced fluorescent concentrator system design (2007)
Goldschmidt, J.C., Peters, M., Löper, P., Schultz, O., Dimroth, F., Glunz, S.W., ...
High-efficiency multijunction solar cells (2007)
The efficiency of a solar cell can be increased by stacking multiple solar cells with a range of bandgap energies, resulting in a multijunction solar cell with a maximum theoretical efficiency limit...
Investigation and development of III-V triple-junction concentrator solar cells (2007)
Guter, W., Dimroth, F., Schöne, J., Philipps, S., Bett, A.W.
Development and production of European III-V multi-junction solar cells (2007)
Meusel, M., Bensch, W., Bergunde, T., Kern, R., Khorenko, V., Köstler, W., ...
1000 Sun, Compact Receiver Based on Monolithic Interconnected Modules (MIMs) (2006)
Löckenhoff, R., Dibowski, G., Dimroth, F., Meusel, M., V. Riesen, S., Bett, A.
Characterization of monolithic III-V multi-junction solar cells - challenges and application (2006)
Meusel, M., Baur, C., Siefer, G., Dimroth, F., Bett, A.W., Warta, W.
The characterization of monolithic III-V multi-junction solar cells is still a challenging task. In this paper we show that quantum efficiency measurements have to be performed under optimized light-...
Thin 5-junction solar cells with improved radiation hardness (2006)
Dimroth, F., Baur, C., Bett, A.W., Köstler, W., Meusel, M., Strobl, G.
Heat sink substrates for automated assembly of concentrator modules (2006)
Jaus, J., Fleischfresser, U., Peharz, G., Dimroth, F., Lerchenmüller, H., Bett, A.W.
European roadmap of multijunction solar cells and qualification status (2006)
Strobl, G., Bergunde, T., Köstler, W., Kern, R., Meusel, M., LaRoche, G., ...
1000 sun, compact receiver based on monolithic interconnected modules (MIMS) (2006)
Löckenhoff, R., Dibowski, G., Dimroth, F., Meusel, M., Riesen, S. Van, Bett, A.W.
Improving the material quality of MOVPE grown (GaIn) (NAs) (2006)
Volz, K., Lackner, D., Rubel, O., Stolz, W., Baur, C., Dimroth, F., ...
Lattice-matched GaInAsSb on GaSb for TPV cells (2006)
Welser, E., Dimroth, F., Ohm, A., Guter, W., Siefer, G., Schöne, J., ...
High-efficiency solar cells from III-V compound semiconductors (2006)
Today's most efficient technology for the generation of electricity from solar radiation is the use of multi-junction solar cells made of III-V compound semiconductors. Efficiencies up to 39 % have...
Hydrogen production in a PV concentrator using III-V multi-junction solar cells (2006)
Dimroth, F., Peharz, G., Wittstadt, U., Hacker, B., Bett, A.W.
Multi-junction solar cells from III-V compound semiconductors can generate ideal voltages for the electrolysis of water. This paper presents results of a PV-concentrator HyConreg with...
FLATCON® Konzentrator-PV-Technologie (2005)
Lerchenmüller, H., Bett, A.W., Siefer, G., Dimroth, F., Willeke, G.
GaSb based PV modules for a TPV generator system (2005)
Schlegl, T., Abbott, P., Aicher, T., Dimroth, F., Siefer, G., Szolak, R., ...
Development status of European multi-junction space solar cells with high radiation hardness (2005)
Meusel, M., Baur, C., Guter, W., Hermle, M., Dimroth, F., Bett, A.W., ...
Large area monolithic interconnected modules (MIMS) for compact concentrator modules (2005)
Loeckenhoff, R., Riesen, S. Van, Meusel, M., Dimroth, F., Bett, A.W.
The FLATCON® concentrator pv-technology ready for the market (2005)
Bett, A.W., Siefer, G., Baur, C., Riesen, S.V., Peharz, G., Lerchenmüller, H., ...
Recent developments in III-V multi-junction space solar cells (2005)
Bett, A.W., Baur, C., Dimroth, F., Guter, W., Meusel, M., Strobl, G.
Analysis of the radiation hardness of triple- and quintuple- junction space solar cells (2005)
Baur, C., Meusel, M., Dimroth, F., Bett, A.W., Nell, M., Strobl, G., ...
Evolution of fully European triple GaAs solar cells (2005)
Strobl, G., Dietrich, R., Hilgarth, J., Kern, R., Köstler, W., LaRoche, G., ...
Large area monolithic interconnected modules (MIMS) for compact concentrator modules (2005)
Loeckenhoff, R., Riesen, S. Van, Meusel, M., Dimroth, F., Bett, A.W.
Detection angle resolved PIXE and the equivalent depth concept for thin film characterization (2005)
Reis, M.A., Chaves, P.C., Corregidor, V., Barradas, N.P., Alves, E., Dimroth, F., ...
The characterization of thin films using PIXE, although basically a simple matter, in practice suffers from significant problems. Here two case studies are presented in which the use of grazing...
MOVPE growth of Sb-based semiconductors in a 9x2-inch planetary® reactor (2004)
Giesen, C., Heuken, M., Dimroth, F., Bett, A.W., Hannappel, T., Kollonitsch, Z., ...
Storgards, J., Méndez, B., Piqueras, J., Chenot, M., Dimroth, F., Bett, A.W.
The luminescence of GaSb and AlGaSb layers grown on GaAs substrates by metal organic vapour phase epitaxy has been studied by means of cathodoluminescence (CL) using a scanning electron microscope....
RBS analysis of AlGaSb thin films (2004)
Barradas, N.P., Alves, E., Ruiz, C.M., Dieguez, E., Dimroth, F., ...
High external quantum efficiency of planar semiconductor structures (2004)
Catchpole, K.R., Lin, K.L., Campbell, P., Green, M.A., Bett, A.W., Dimroth, F.
We have measured a very high photoluminescence external quantum efficiency (EQE) of 92% for a GaAs/GaInP double heterostructure mounted on a planar substrate. The measurement was made using a system...
Characterisation of a 300 x photovoltaic concentrator system with one- axis tracking (2003)
Hein, M., Dimroth, F., Siefer, G., Bett, A.W.
A solar concentrator with one-axis tracking is being developed at our institute. This concentrator system achieves a high geometrical concentration ratio of 300 using a parabolic trough mirror and a...
GaSb-, InGaAsSb-, InAsSbp- and Ge-TPV cells for low-temperature TPV applications (2003)
Sulima, O.V., Bett, A.W., Mauk, M.G., Dimroth, F., Dutta, P.S., Mueller, R.L.
Advanced GaInP/Ga(In)As/Ge triple junction space solar cells (2003)
Strobl, G., Dietrich, R., Hilgarth, J., Köstler, W., Kern, R., Nell, M., ...
5-Junction III-V solar cells for space (2003)
Dimroth, F., Baur, C., Meusel, M., Riesen, S. Van, Bett, A.W.
Flatcon-modules. Technology and characterisation (2003)
Bett, A.W., Baur, C., Dimroth, F., Lange, G., Meusel, M., Riesen, S. Van, ...
Development of a 1.0 eV (GaIn)(NAs) solar cell (2003)
Baur, C., Bett, A.W., Dimroth, F., Riesen, S. Van, Kunert, B., Traversa, M., ...
Correlation of reduced oxygen content in precursors with improved MOVPE layer quality (2003)
Rushworth, S.A., Smith, L.M., Ravetz, M.S., Coward, K.M., Odedra, R., Kanjolia, R., ...
Meusel, M., Adelhelm, R., Dimroth, F., Bett, A.W., Warta, W.
III-V monolithic multi-junction (MJ) solar cells reach efficiencies exceeding 30% (AM1.5 global) and have applications in space and in terrestrial concentrator systems. The subcells of monolithic MJ...
Advanced GaInP/Ga(In)As/Ge triple-junction space solar cells (2002)
Strobl, G., Hilgarth, J., Nell, M., Dietrich, R., Kern, R., Köstler, W., ...
Development of III-V-Based concentrator cells and their application in PV-modules (2002)
Bett, A.W., Dimroth, F., Hein, F., Lange, G., Meusel, M., Schubert, U., ...
Influence of Sb, Bi, Tl, and B on the incorporation of N in GaAs (2002)
Dimroth, F., Howard, A., Shurtleff, J.K., Stringfellow, G.B.
Hein, M., Meusel, M., Baur, C., Dimroth, F., Lange, G., Siefer, G., ...
In this paper a 192 cm2 high efficiency Fresnel lens module is presented. An outdoor efficiency of up to 24.9 % was measured. The module uses Ga 0.35 In 0.65 P/Ga 0.83 In 0.17 As dual-junction...
Hein, M., Meusel, M., Baur, C., Dimroth, F., Lange, G., Siefer, G., ...
In this paper a 192 cm2 high efficiency Fresnel lens module is presented. An outdoor efficiency of up to 24.9 % was measured. The module uses Ga 0.35 In 0.65 P/Ga 0.83 In 0.17 As dual-junction...
Development of III-V-Based concentrator cells and their application in PV-modules (2002)
Bett, A.W., Dimroth, F., Hein, F., Lange, G., Meusel, M., Schubert, U., ...
Dimroth, F., Beckert, R., Meusel, M., Schubert, U., Bett, A.W.
The use of Ga/sub 1-x/In/sub x/As instead of GaAs as a bottom solar cell in a Ga/sub y/In/sub 1-y/P/Ga/sub 1-x/In/sub x/As tandem structure increases the flexibility of choosing the optimum bandgap...
Advanced III-V solar cell structures grown by MOVPE (2001)
Bett, A.W., Adelhelm, R., Agert, C., Beckert, R., Dimroth, F., Schubert, U.
Radiation response of dual-junction Ga(x)In(1-x)P/Ga(y)In(1-y)As solar cells (2000)
Walters, R.J., Summers, G.P., Bett, A.W., Dimroth, F., Hofmann, R.W., Stan, M.A., ...
Radiation response of Ga(x)In(1-x)As solar cells (2000)
Walters, R.J., Messenger, S.R., Summers, G.P., Bett, A.W., Dimroth, F., ...
Procedures for evaluating multijunction concentrators (2000)
Emery, K., Moriarty, T., Kurtz, S., Meusel, M., Beckert, R., Dimroth, F., ...
Low oxygen content trimethylaluminium and trimethylindium for MOVPE of light emitting devices (2000)
Smith, L.M., Rushworth, S.A., Ravetz, M.S., Odedra, R., Konjolia, R., Agert, C., ...
30 per cent monolithic tandem concentrator solar cells for concentrations exceeding 1000 suns (2000)
Bett, A.W., Dimroth, F., Lange, G., Meusel, M., Beckert, R., Hein, M., ...
Radiation response of dual-junction Ga(y)In(1-y)P/Ga(1-x)In(x)As solar cells (2000)
Dimroth, F., Bett, A.W., Walters, R.J., Summers, G.P., Messenger, S.R., Takamoto, T., ...
Development of Ga(5.51)In(0.49)P/GaAs tandem solar cells on an industrial size MOVPE reactor (2000)
Bett, A.W., Dimroth, F., Meusel, M., Schubert, U., Adelhelm, R.
Concentrator array based on GaAs cells and fresnel lens concentrator (2000)
Andreev, A., Bett, A.W., Dimroth, F., Hein, M., Letay, G., Rumyantsev, V. D., ...
Radiation response of dual-junction GayIn1-yP/Ga1- xInxAs solar-cells (2000)
Dimroth, F., Bett, A.W., Walters, R.J., Summers, G.P., Messenger, S.R., Takamoto, T., ...