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Warta, Wilhelm

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Research Profile

Latest Publications

1.
2011

Schindler F.; Geilker J.; Kwapil W.; Warta W.; Schubert M. C.

Hall mobility in multicrystalline silicon
J. Appl. Phys. 110, 043722 (2011)
Fraunhofer Institut für Solare Energiesysteme, Heidenhofstr. 2, 79110 Freiburg, Germany
2.
2011

Breitenstein Otwin; Bauer Jan; Bothe Karsten; Kwapil Wolfram; Lausch Dominik; Rau Uwe; Schmidt Jan; Schneemann Matthias; Schubert Martin C.; Wagner Jan-Martin; Warta Wilhelm

Understanding junction breakdown in multicrystalline solar cells
J. Appl. Phys. 109, 071101 (2011)
Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle, Germany
3.
2011

Schön J.; Habenicht H.; Schubert M. C.; Warta W.

Understanding the distribution of iron in multicrystalline silicon after emitter formation: Theoretical model and experiments
J. Appl. Phys. 109, 063717 (2011)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, 79110 Freiburg, Germany

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All Publications

1.
2011

Schindler F.; Geilker J.; Kwapil W.; Warta W.; Schubert M. C.

Hall mobility in multicrystalline silicon
J. Appl. Phys. 110, 043722 (2011)
Fraunhofer Institut für Solare Energiesysteme, Heidenhofstr. 2, 79110 Freiburg, Germany
2.
2011

Breitenstein Otwin; Bauer Jan; Bothe Karsten; Kwapil Wolfram; Lausch Dominik; Rau Uwe; Schmidt Jan; Schneemann Matthias; Schubert Martin C.; Wagner Jan-Martin; Warta Wilhelm

Understanding junction breakdown in multicrystalline solar cells
J. Appl. Phys. 109, 071101 (2011)
Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle, Germany
3.
2011

Schön J.; Habenicht H.; Schubert M. C.; Warta W.

Understanding the distribution of iron in multicrystalline silicon after emitter formation: Theoretical model and experiments
J. Appl. Phys. 109, 063717 (2011)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, 79110 Freiburg, Germany
4.
2010

Gundel Paul; Kwapil Wolfram; Schubert Martin C.; Seifert Holger; Warta Wilhelm

Approach to the physical origin of breakdown in silicon solar cells by optical spectroscopy
J. Appl. Phys. 108, 123703 (2010)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, D-79110 Freiburg, Germany
5.
2010

Gundel Paul; Schubert Martin C.; Heinz Friedemann D.; Kwapil Wolfram; Warta Wilhelm; Martinez-Criado Gema; Reiche Manfred; Weber Eicke R.

Impact of stress on the recombination at metal precipitates in silicon
J. Appl. Phys. 108, 103707 (2010)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, 79110 Freiburg, Baden, Germany
6.
2010

Giesecke J. A.; Schubert M. C.; Walter D.; Warta W.

Minority carrier lifetime in silicon wafers from quasi-steady-state photoluminescence
Appl. Phys. Lett. 97, 092109 (2010)
Fraunhofer Institut für Solare Energiesysteme, Heidenhofstr. 2, 79110 Freiburg, Germany
7.
2010

Habenicht Holger; Schubert Martin C.; Warta Wilhelm

Imaging of chromium point defects in p-type silicon
J. Appl. Phys. 108, 034909 (2010)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, D-79110 Freiburg, Germany
8.
2010

Gundel Paul; Heinz Friedemann D.; Schubert Martin C.; Giesecke Johannes A.; Warta Wilhelm

Quantitative carrier lifetime measurement with micron resolution
J. Appl. Phys. 108, 033705 (2010)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, 79110 Freiburg, Germany
9.
2010

Kwapil Wolfram; Wagner Matthias; Schubert Martin C.; Warta Wilhelm

High net doping concentration responsible for critical diode breakdown behavior of upgraded metallurgical grade multicrystalline silicon solar cells
J. Appl. Phys. 108, 023708 (2010)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, 79110 Freiburg, Germany
10.
2010

Glatthaar M.; Haunschild J.; Zeidler R.; Demant M.; Greulich J.; Michl B.; Warta W.; Rein S.; Preu R.

Evaluating luminescence based voltage images of silicon solar cells
J. Appl. Phys. 108, 014501 (2010)
Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstr. 2, 79110 Freiburg, Germany
11.
2009

Kwapil Wolfram; Gundel Paul; Schubert Martin C.; Heinz Friedemann D.; Warta Wilhelm; Weber Eicke R.; Goetzberger Adolf; Martinez-Criado Gema

Observation of metal precipitates at prebreakdown sites in multicrystalline silicon solar cells
Appl. Phys. Lett. 95, 232113 (2009)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, 79110 Freiburg, Germany
12.
2009

Kwapil Wolfram; Kasemann Martin; Gundel Paul; Schubert Martin C.; Warta Wilhelm; Bronsveld Paula; Coletti Gianluca

Diode breakdown related to recombination active defects in block-cast multicrystalline silicon solar cells
J. Appl. Phys. 106, 063530 (2009)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, 79110 Freiburg, Germany
13.
2009

Giesecke J. A.; Kasemann M.; Warta W.

Determination of local minority carrier diffusion lengths in crystalline silicon from luminescence images
J. Appl. Phys. 106, 014907 (2009)
Fraunhofer Institut für Solare Energiesysteme, Heidenhofstr. 2, 79110 Freiburg, Germany
14.
2009

Schubert Martin C.; Kerler Michael J.; Warta Wilhelm

Influence of heterogeneous profiles in carrier density measurements with respect to iron concentration measurements in silicon
J. Appl. Phys. 105, 114903 (2009)
Fraunhofer Institute of Solar Energy Systems, Heidenhofstrasse 2, 9110 Freiburg, Germany
15.
2009

Glatthaar Markus; Giesecke Johannes; Kasemann Martin; Haunschild Jonas; The Manuel; Warta Wilhem; Rein Stefan

Spatially resolved determination of the dark saturation current of silicon solar cells from electroluminescence images
J. Appl. Phys. 105, 113110 (2009)
Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstr. 2, 79110 Freiburg i. Br., Germany
16.
2009

Roth Thomas; Hohl-Ebinger Jochen; Grote Daniela; Schmich Evelyn; Warta Wilhelm; Glunz Stefan W.; Sinton Ronald A.

Illumination-induced errors associated with suns-VOC measurements of silicon solar cells
Rev. Sci. Instrum. 80, 033106 (2009)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstrasse 2, 79110 Freiburg, Germany
17.
2009

Rosenits Philipp; Roth Thomas; Warta Wilhelm; Reber Stefan; Glunz Stefan W.

Determining the excess carrier lifetime in crystalline silicon thin-films by photoluminescence measurements
J. Appl. Phys. 105, 053714 (2009)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, D-79110 Freiburg, Germany
18.
2008

Roth Thomas; Rüdiger Marc; Warta Wilhelm; Glunz Stefan W.

Electronic properties of titanium in boron-doped silicon analyzed by temperature-dependent photoluminescence and injection-dependent photoconductance lifetime spectroscopy
J. Appl. Phys. 104, 074510 (2008)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstrasse 2, 79110 Freiburg, Germany
19.
2008

Gundel Paul; Schubert Martin C.; Warta Wilhelm

Origin of trapping in multicrystalline silicon
J. Appl. Phys. 104, 073716 (2008)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, 79110 Freiburg, Germany
20.
2008

Kasemann Martin; Walter Benjamin; Meinhardt Christoph; Ebser Jan; Kwapil Wolfram; Warta Wilhelm

Emissivity-corrected power loss calibration for lock-in thermography measurements on silicon solar cells
J. Appl. Phys. 103, 113503 (2008)
Material Research Center, University of Freiburg, Stefan-Meier-Strasse 21, 79104 Freiburg, Germany
21.
2007

Schubert Martin C.; Pingel Sebastian; The Manuel; Warta Wilhelm

Quantitative carrier lifetime images optically measured on rough silicon wafers
J. Appl. Phys. 101, 124907 (2007)
Freiburger Materialforschungszentrum FMF, Stefan-Meier-Strasse 21, 79104 Freiburg, Germany
22.
2007

Würfel P.; Trupke T.; Puzzer T.; Schäffer E.; Warta W.; Glunz S. W.

Diffusion lengths of silicon solar cells from luminescence images
J. Appl. Phys. 101, 123110 (2007)
Centre of Excellence for Advanced Silicon Photovoltaics and Photonics, University of New South Wales, Sydney, NSW 2052, Australia
23.
2007

Stokkan G.; Riepe S.; Lohne O.; Warta W.

Spatially resolved modeling of the combined effect of dislocations and grain boundaries on minority carrier lifetime in multicrystalline silicon
J. Appl. Phys. 101, 053515 (2007)
Norwegian University of Science and Technology, Alfred Getz vei 2, N-7491 Trondheim, Norway
24.
2006

Kasemann Martin; Schubert Martin C.; The Manuel; Köber Mariana; Hermle Martin; Warta Wilhelm

Comparison of luminescence imaging and illuminated lock-in thermography on silicon solar cells
Appl. Phys. Lett. 89, 224102 (2006)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstrasse 2, 79110 Freiburg, Germany
25.
2006

Kieliba Thomas; Riepe Stephan; Warta Wilhelm

Effect of dislocations on open circuit voltage in crystalline silicon solar cells
J. Appl. Phys. 100, 093708 (2006)
Fraunhofer Institute for Solar Energy Systems, Heidenhofstrasse 2, 79110 Freiburg, Germany
26.
2006

Kieliba Thomas; Riepe Stephan; Warta Wilhelm

Effect of dislocations on minority carrier diffusion length in practical silicon solar cells
J. Appl. Phys. 100, 063706 (2006)
Fraunhofer Institute for Solar Energy Systems, Heidenhofstrasse 2, 79110 Freiburg, Germany
27.
2006

Trupke T.; Bardos R. A.; Schubert M. C.; Warta W.

Photoluminescence imaging of silicon wafers
Appl. Phys. Lett. 89, 044107 (2006)
Centre of Excellence for Advanced Silicon Photovoltaics and Photonics, University of New South Wales, Sydney 2052, Australia
28.
2006

Schubert Martin C.; Riepe Stephan; Bermejo Sandra; Warta Wilhelm

Determination of spatially resolved trapping parameters in silicon with injection dependent carrier density imaging
J. Appl. Phys. 99, 114908 (2006)
Freiburger Materialforschungszentrum FMF, Stefan-Meier-Strasse 21, 79104 Freiburg, Germany
29.
2005

Buonassisi T.; Istratov A. A.; Peters S.; Ballif C.; Isenberg J.; Riepe S.; Warta W.; Schindler R.; Willeke G.; Cai Z.; Lai B.; Weber E. R.

Impact of metal silicide precipitate dissolution during rapid thermal processing of multicrystalline silicon solar cells
Appl. Phys. Lett. 87, 121918 (2005)
Department of Materials Sciences and Engineering, University of California, Berkeley and Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
30.
2005

Buonassisi T.; Istratov A. A.; Pickett M. D.; Marcus M. A.; Hahn G.; Riepe S.; Isenberg J.; Warta W.; Willeke G.; Ciszek T. F.; Weber E. R.

Quantifying the effect of metal-rich precipitates on minority carrier diffusion length in multicrystalline silicon using synchrotron-based spectrally resolved x-ray beam-induced current
Appl. Phys. Lett. 87, 044101 (2005)
Department of Materials Science and Engineering, University of California, Berkeley and Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
31.
2005

Buonassisi Tonio; Jonczyk Ralf; Istratov Andrei A.; Heuer Matthias; Marcus Matthew A.; Isenberg Joerg; Lai Barry; Cai Zhonghou; Heald Steven; Warta Wilhelm; Schindler Roland; Willeke Gerhard; Weber Eicke R.

Synchrotron-based investigations of the nature and impact of iron contamination in multicrystalline silicon solar cells
J. Appl. Phys. 97, 074901 (2005)
Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720 and Electronics Research Laboratory, Department of Materials Science and Engineering, University of California, Berkeley, California 94720
32.
2004

Isenberg Joerg; Warta Wilhelm

Realistic evaluation of power losses in solar cells by using thermographic methods
J. Appl. Phys. 95, 5200 (2004)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, D-79110 Freiburg, Germany;
33.
2004

Isenberg Joerg; Warta Wilhelm

Free carrier absorption in heavily doped silicon layers
Appl. Phys. Lett. 84, 2265 (2004)
Fraunhofer Institute Solar Energy Systems (ISE), Heidenhofstrasse 2, 79110 Freiburg, Germany;
34.
2003

Schubert Martin C.; Isenberg Joerg; Warta Wilhelm

Spatially resolved lifetime imaging of silicon wafers by measurement of infrared emission
J. Appl. Phys. 94, 4139 (2003)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstrasse 2, D-79110 Freiburg, Germany;
35.
2003

Isenberg Joerg; Dicker Jochen; Warta Wilhelm

Averaging of laterally inhomogeneous lifetimes for one-dimensional modeling of solar cells
J. Appl. Phys. 94, 4122 (2003)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, D-79110 Freiburg, Germany
36.
2003

Isenberg J.; Reber S.; Warta W.

Diffusion Properties of Ion-Implanted Vanadium in PECVD-SiO2 and PECVD-SiNx
J. Electrochem. Soc. 150, G365 (2003)
Freiburger Materialforschungszentrum, Albert-Ludwig Universität Freiburg, D-79104 Freiburg, Germany;
37.
2003

Isenberg Joerg; Riepe Stephan; Glunz Stefan W.; Warta Wilhelm

Imaging method for laterally resolved measurement of minority carrier densities and lifetimes: Measurement principle and first applications
J. Appl. Phys. 93, 4268 (2003)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstrasse 2, D-79110 Freiburg, Germany;
38.
2002

Dicker J.; Schumacher J. O.; Warta W.; Glunz S. W.

Analysis of one-sun monocrystalline rear-contacted silicon solar cells with efficiencies of 22.1%
J. Appl. Phys. 91, 4335 (2002)
Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstrasse 2, D-79110 Freiburg, Germany
39.
2002

Rein S.; Warta W.; Rehrl T.; Glunz S. W.

Lifetime spectroscopy for defect characterization: Systematic analysis of the possibilities and restrictions
J. Appl. Phys. 91, 2059 (2002)
Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, D-79110 Freiburg, Germany;
40.
2001

Glunz S. W.; Rein S.; Lee J. Y.; Warta W.

Minority carrier lifetime degradation in boron-doped Czochralski silicon
J. Appl. Phys. 90, 2397 (2001)
Fraunhofer Institute for Solar Energy Systems, Oltmannsstr. 22, D-79100 Freiburg, Germany
41.
1999

Glunz S. W.; Biro D.; Rein S.; Warta W.

Field-effect passivation of the SiO2Si interface
J. Appl. Phys. 86, 683 (1999)
Fraunhofer Institute for Solar Energy Systems, Oltmannsstrasse 22, D-79100 Freiburg, Germany;
42.
1995

Glunz Stefan W.; Warta Wilhelm

High‐resolution lifetime mapping using modulated free‐carrier absorption
J. Appl. Phys. 77, 3243 (1995)
Fraunhofer‐Institute for Solar Energy Systems (FhG‐ISE), Oltmannsstrasse 22, D‐79100 Freiburg, Germany;
43.
1994

Glunz Stefan W.; Sproul Alistair B.; Warta Wilhelm; Wettling Wolfram

Injection‐level‐dependent recombination velocities at the Si‐SiO;2 interface for various dopant concentrations
J. Appl. Phys. 75, 1611 (1994)
Fraunhofer‐Institut für Solare Energiesysteme (ISE), D‐79100 Freiburg, Oltmannsstrasse 22, Germany;
44.
1992

Aberle Armin G.; Glunz Stefan; Warta Wilhelm

Impact of illumination level and oxide parameters on Shockley–Read–Hall recombination at the Si‐SiO;2 interface
J. Appl. Phys. 71, 4422 (1992)
Fraunhofer‐Institut für Solare Energiesysteme (ISE), D‐7800 Freiburg, Oltmannsstrasse 22, Federal Republic of Germany;
45.
1985

Warta Wilhelm; Karl Norbert

Hot holes in naphthalene: High, electric‐field‐dependent mobilities
Phys. Rev. B 32, 1172 (1985)
Physikalisches Institut der Universitat Stuttgart, D‐7000 Stuttgart 80, Pfaffenwaldring 57, Federal Republic of Germany;

Co-authors

Co-publications
18

Schubert, Martin C.
9

Glunz, Stefan W.
9

Isenberg, Joerg
7

Riepe, Stephan
6

Gundel, Paul
5

Rein, Stefan
5

Kasemann, Martin
5

Weber, Eicke R.
4

Giesecke, Johannes
3

The, Manuel
3

Willeke, Gerhard
3

Roth, Thomas
3

Istratov, Andrei A.
3

Buonassisi, Tonio
2

Marcus, Matthew A.