Publications & Conferences

Conferences

2018

  • DPG-Frühjahrstagung der Sektion Kondensierte Materie (SKM) und EPS-CMD27, March 11 – 16, 2018, Berlin (Germany)
    – M. Malitckaya, H.-P. Komsa, V. Havu, and M. Puska, Structural and electronic properties of AlkInSe2/CuInSe2 (Alk = K, Rb, Cs) interfaces from density functional theory calculations, ORAL PRESENTATION
  • H2020 1st Coordinators´ Workshop on Photovoltaics, February 06, 2018, Brussels (Belgium)
    – W. Witte, Sharc25, ORAL PRESENTATION

2017

  • Ninth Joint BER II and BESSY II User Meeting, December 13 – 15, 2017, Berlin (Germany)
    – J. Bombsch, E. Avancini, R. Carron, T. Kunze, E. Handick, R. Garcia-Diez, Y. Zhang, R. Félix, R. G. Wilks, S. Buecheler, and M. Bär, Impact of alkali fluoride post-deposition treatment on Cu(In,Ga)Se2/CdS interface formation investigated by hard X-ray photoelectron spectroscopy, VISUAL PRESENTATION
  • European workshop on nanotechnologies & advanced materials for photovoltaics & concentrated solar power, October 24 – 25, 2017, Brussels (Belgium)
    – W. Witte, Sharc25 project: Super high efficiency Cu(In,Ga)Se2 thin-film solar cells approaching 25%, ORAL PRESENTATION
  • 33rd EU PVSEC, September 25 – 29, 2017, Amsterdam (The Netherlands)
    – W. Witte, P. Jackson, D. Hariskos, F. Kessler, M. Powalla, S. Buecheler, R. Carron, E. Avancini, B. Bissig, T. Weiss, S. Siebentritt, F. Werner, M. H. Wolter, P. Pareige, P. Moguerou, S. Duguay, E. Cadel, C. Castro, A. Vilalta-Clemente, R. Menozzi, G. Sozzi, S. Di Napoli, E. Bourgeois, G. Degutis, M. Bär, R. G. Wilks, T. Kunze, S. Sadewasser, N. Nicoara, M. Puska, M. Fedina, H.-P. Komsa, V. Havu, P. Reinhard, B. Dimmler, R. Wächter, and A. N. Tiwari, Influence of post-deposition treatment with alkali elements on bulk and interface properties of high efficiency Cu(In,Ga)Se2 solar cells: Results of the EU project Sharc25, ORAL PRESENTATION
  • NEXTGEN 2017, Nanotechnology and Next Generation High-Efficiency Photovoltaics International School and Workshop, September 12 – 15, 2017, Palma, Mallorca (Spain)
    – W. Witte, Measures to increase CIGS cell efficiency towards 25%, ORAL PRESENTATION
    – M. H. Wolter, B. Bissig, P. Reinhard, E. Avancini, R. Carron, S. Buecheler, W. Witte, P. Jackson, and S. Siebentritt, Influence of interference and alkali post-deposition treatment on the quasi-Fermi level splitting of Cu(In,Ga)Se2 thin films, ORAL PRESENTATION
    – A. Vilalta-Clemente, C. Castro, S. Duguay, E. Cadel, P. Pareige, P. Jackson, R. Wuerz, D. Hariskos, and W. Witte, Rb alkali distribution in Cu(In,Ga)Se2 solar cells on a nanometer scale, ORAL PRESENTATION
  • 44th IEEE PVSC, June 25 – 30, 2017, Washington D.C. (USA)
    – N. Nicoara, P. Jackson, D. Hariskos, T. Lepetit, S. Harel, L. Arzel, W. Witte, N. Barreau, and S. Sadewasser, Nanoscale electronic properties of Cu(In,Ga)Se2 absorber surfaces and absorber/buffer interfaces after alkali post-deposition treatments, ORAL PRESENTATION
    – G. Sozzi, S. Di Napoli, R. Menozzi, F. Werner, S. Siebentritt, P. Jackson, and W. Witte, Influence of conduction band offsets at window/buffer and buffer/absorber interfaces on the roll-over of J-V curves of CIGS solar cells, ORAL PRESENTATION
    – M. H. Wolter, B. Bissig, E. Avancini, R. Carron, S. Buecheler, and S. Siebentritt, Influence of sodium and rubidium post-deposition treatment on the quasi-Fermi level splitting of Cu(In,Ga)Se2 thin films, ORAL PRESENTATION
  • IW-CIGSTech-8, May 30, 2017, Stuttgart (Germany)
    – W. Witte, P. Jackson, D. Hariskos, F. Kessler, M. Powalla, S. Buecheler, R. Carron, E. Avancini, B. Bissig, T. Weiss, S. Siebentritt, F. Werner, M. H. Wolter, P. Pareige, P. Moguerou, S. Duguay, E. Cadel, C. Castro, A. Vilalta-Clemente, R. Menozzi, G. Sozzi, S. Di Napoli, E. Bourgeois, G. Degutis, M. Bär, R. G. Wilks, T. Kunze, S. Sadewasser, N. Nicoara, M. Puska, M. Fedina, H.-P. Komsa, V. Havu, P. Reinhard, B. Dimmler, R. Wächter, and A. N. Tiwari, In-depth characterization of high efficiency Cu(In,Ga)Se2 solar cells: Results of the EU project Sharc25, VISUAL PRESENTATION
  • E-MRS Spring Meeting, May 22 – 26, 2017, Strasbourg (France)
    – W. Witte, R. Carron, D. Hariskos, F. Fu, R. Menner, and S. Buecheler, Indium zinc oxide and hydrogen-doped indium oxide window layers combined with Zn(O,S) and CdS buffers for Cu(In,Ga)Se2 thin-film solar cells, ORAL PRESENTATION
    – A. Vilalta-Clemente, C. Castro, M. Raghuwanshi, S. Duguay, E. Cadel, P. Pareige, P. Jackson, D. Hariskos, and W. Witte, Distribution of alkali elements in Cu(In,Ga)Se2 solar cells on a nanometer scale, ORAL PRESENTATION
  • MRS Spring Meeting, April 17 – 21, 2017, Phoenix, AZ (USA)
    – T. Kunze, P. Jackson, D. Hariskos, A. Siebert, C. Hartmann, R. Felix Duarte, X. Kozina, D. Gerlach, Y. Yamashita, T. Chikyow, S. Ueda, R. Wilks, W. Witte, and M. Baer, Impact of different alkali post deposition treatments on the formation of the Zn(O,S)/Cu(In,Ga)Se2 interface, ORAL PRESENTATION
    – N. Nicoara, P. Jackson, D. Hariskos, W. Witte, and S. Sadewasser, Comparison of the interface formation of Cu(In,Ga)Se2 with RbF post-deposition treatment and CdS and ZnS buffer layers, ORAL PRESENTATION
    – T. Weiss, S. Nishiwaki, B. Bissig, E. Avancini, S. Buecheler, and A. Tiwari, Voltage Dependent Admittance Spectroscopy for the Detection of near Interface Defect States and the Extraction of the Doping Density, ORAL PRESENTATION
    – E. Avancini, S. Nishiwaki, D. Keller, T. Weiss, R. Carron, T. Feurer, A. Filippin, B. Bissig, S. Buecheler, A. Tiwari, Structural Defects and Lateral Composition Inhomogeneities in Cu(In,Ga)Se2 Layers Grown by Multistage Co-Evaporation, ORAL PRESENTATION
  • DPG-Frühjahrstagung der Sektion Kondensierte Materie (SKM), March 19 – 24, 2017, Dresden (Germany)
    – M. Fedina, H.-P. Komsa, V. Havu, and M. Puska, First-principles modeling the alkali-metal post-deposition treatment of CIGS solar cells, ORAL PRESENTATION

2016

  • Eighth Joint BER II and BESSY II User Meeting, December 7 – 9, 2016, Berlin (Germany)
    – T. Kunze, P. Jackson, D. Hariskos, A. Siebert, C. Hartmann, X. Kozina, R. Felix, D. Gerlach, Y. Yamashita, S. Ueda, T. Chikyow, R. G. Wilks, W. Witte, and M. Bär, In-depth analysis of the Zn(O,S) / Cu(In,Ga)Se2 interface formation, VISUAL PRESENTATION
  • PVSEC-26, October 24 – 28, 2016, Singapore
    – N. Nicoara, T. Kunze, D. Hariskos, P. Jackson, R. Félix, R.G. Wilks, W. Witte, M. Bär, and S. Sadewasser, Spatially-resolved insight into the formation of the CdS/Cu(In,Ga)Se2 interface – evidence for chemical and electronic non-uniformities, ORAL PRESENTATION
  • BESSY II Foresight Workshop on Energy Materials Research, October 10 – 11, 2016, Berlin (Germany)
    – T. Kunze, P. Jackson, D. Hariskos, W. Witte, D. Gerlach, Y. Yamashita, T. Chikyow, S. Ueda, A. Siebert, C. Hartmann, X. Kozina, R. Felix, R. G. Wilks, and M. Bär, Monitoring the formation of the Zn(O,S) / Cu(In,Ga)Se2 interface, VISUAL PRESENTATION
  • ICTMC-20, September 5 – 9, 2016, Halle (Saale) (Germany)
    M. H. Wolter, P. Reinhard, B. Bissig, P. Jackson, and S. Siebentritt, Correcting for interference effects in photoluminescence in Cu(In,Ga)Se2 based thin films, VISUAL PRESENTATION
  • 16th EMC, August 28 – September 2, 2016, Lyon (France)
    – C. Castro, M. Raghuwanshi, P. Pareige, S. Duguay, E. Cadel, W. Witte, P. Jackson, D. Hariskos, F. Kessler, S. Buecheler, R. Carron, E. Avancini, B. Bissig, and A. N. Tiwari, Combining TEM and APT for a better understanding of super high efficiency Cu(In,Ga)Se2 thin film solar cells, VISUAL PRESENTATION
  • 32nd EU PVSEC, June 20 – 24, 2016, Munich (Germany)
    – W. Witte, P. Jackson, D. Hariskos, F. Kessler, S. Buecheler, R. Carron, E. Avancini, B. Bissig, S. Siebentritt, F. Werner, M. Wolter, P. Pareige, P. Muguerou, S. Duguay, E. Cadel, C. Castro, M. Raghuwanshi, R. Menozzi, G. Sozzi, E. Bourgeois, G. Degutis, A. Hardy, M. Bär, R. G. Wilks, T. Kunze, S. Sadewasser, N. Nicoara, M. Puska, M. Fedina, H.-P. Komsa, V. Havu, D. Bremaud, B. Dimmler, R. Wächter, and A. N. Tiwari, Super high efficiency Cu(In,Ga)Se2 thin-film solar cells approaching 25%: Results of the EU project Sharc25, VISUAL PRESENTATION
  • 43rd IEEE PVSC, June 5 – 10, 2016, Portland, OR (USA)
    – E. Handick, P. Reinhard, R. G. Wilks, F. Pianezzi, T. Kunze, D. Kreikemeyer-Lorenzo, L. Weinhardt, M. Blum, W. Yang, M. Gorgoi, E. Ikenaga, D. Gerlach, S. Ueda, Y. Yamashita, T. Chikyow, C. Heske, S. Buecheler, A. N. Tiwari, and M. Bär, NaF/KF post-deposition treatment induced formation of a K-In-Se – type surface species on Cu(In,Ga)Se2 thin-film solar cell absorbers, ORAL PRESENTATION
    – G. Sozzi, M. Lazzarini, R. Menozzi, R. Carron, E. Avancini, B. Bissig, S. Buecheler, and A. N. Tiwari, A numerical study of the use of C-V characteristics to extract the doping density of CIGS absorbers, VISUAL PRESENTATION
    – G. Sozzi, S. Di Napoli, R. Menozzi, R. Carron, E. Avancini, B. Bissig, S. Buecheler, and A. N. Tiwari, Analysis of Ga grading in CIGS absorbers with different Cu content, VISUAL PRESENTATION
  • EU PV Clusters 3rd workshop and General Assembly, May 25 – 26, 2016, Barcelona (Spain)
    – W. Witte, Super high efficiency Cu(In,Ga)Se2 thin-film solar cells approaching 25%, ORAL PRESENTATION
  • E-MRS Spring Meeting, May 2 – 6, 2016, Lille (France)
    – R. Carron, E. Avancini, B. Bissig, P. A. Losio, B. Ruhstaller, J. Steinhauser, S. Buecheler, and A. N. Tiwari, Refractive indices of layers of Cu(In,Ga)Se2 solar cells, ORAL PRESENTATION
    – M. Fedina, H.-P. Komsa, V. Havu, and M. Puska, Native defects and alkali metal impurities in CIGS materials, first principles calculations revisited, VISUAL PRESENTATION
  • Physics Days 2016, March 29 – 31, 2016, Oulu (Finland)
    – M. Fedina, H.-P. Komsa, V. Havu, and M. Puska, Native point defects and alkali metal impurities in CIGS materials, first principles calculations revisited, ORAL PRESENTATION

2015

  • Seventh Joint BER II and BESSY II User Meeting, December 9 – 11, 2015, Berlin (Germany)
    – T. Kunze, P. Jackson, D. Hariskos, W. Witte, D. Gerlach, Y. Yamashita, T. Chikyow, S. Ueda, R. Felix, R. G. Wilks, and M. Bär, Monitoring the formation of the CdS / Cu(In,Ga)Se2 interface, VISUAL PRESENTATION

Publications (peer reviewed)

2018

  • A. Vilalta-Clemente, M. Raghuwanshi, S. Duguay, C. Castro, E. Cadel, P. Pareige, P. Jackson, R. Wuerz, D. Hariskos, and W. Witte, Rubidium distribution at atomic scale in high efficient Cu(In,Ga)Se2 thin-film solar cells, Appl. Phys. Lett. 112 (2018) 103105.
    DOI: 10.1063/1.5020805
  • J. Löckinger, S. Nishiwaki, T. P. Weiss, B. Bissig, Y. E. Romanyuk, S. Buecheler, and A. N. Tiwari, TiO2 as intermediate buffer layer in Cu(In,Ga)Se2 solar cells, Sol. Energy Mater. Sol. Cells 174 (2018) 397
    DOI: 10.1016/j.solmat.2017.09.030

2017

  • N. Nicoara, T. Kunze, P. Jackson, D. Hariskos, R. Félix Duarte, R. G. Wilks, W. Witte, M. Bär, and S. Sadewasser, Evidence for Chemical and Electronic Nonuniformities in the Formation of the Interface of RbF-Treated Cu(In,Ga)Se2 with CdS, ACS Appl. Mater. Interfaces 9 (2017) 44173
    DOI: 10.1021/acsami.7b12448
  • W. Witte, R. Carron, D. Hariskos, F. Fu, R. Menner, and S. Buecheler, IZO or IOH Window Layers Combined with Zn(O,S) and CdS Buffers for Cu(In,Ga)Se2 Solar Cells, Phys. Stat. Sol. A 214 (2017) 1700688
    DOI: 10.1002/pssa.201700688
  • T. P. Weiss, S. Nishiwaki, B. Bissig, R. Carron, E. Avancini, J. Löckinger, S. Buecheler, and A. N. Tiwari, Injection Current Barrier Formation for RbF Postdeposition-Treated Cu(In,Ga)Se2-Based Solar Cells, Adv. Mater. Interfaces (2017) 1701007
    DOI: 10.1002/admi.201701007
  • T. P. Weiss, S. Nishiwaki, B. Bissig, S. Buecheler, and A. N. Tiwari, Voltage dependent admittance spectroscopy for the detection of near interface defect states for thin film solar cells, Phys. Chem. Chem. Phys. 19 (2017) 30410
    DOI: 10.1039/c7cp05236g
  • M. Malitckaya, H.-P. Komsa, V. Havu, and M. J. Puska, Effect of alkali metal atom doping on the CuInSe2-based solar cell absorber, J. Phys. Chem. C 121 (2017) 15516
    DOI: 10.1021/acs.jpcc.7b03083
  • G. Sozzi, S. Di Napoli, R. Menozzi, B. Bissig, S. Buecheler, and A. N. Tiwari, Impact of front-side point contact/passivation geometry on thin-film solar cell performance, Sol. Energy Mater. Sol. Cells 165 (2017) 94
    DOI: 10.1016/j.solmat.2017.02.031
  • M. H. Wolter, B. Bissig, P. Reinhard, S. Buecheler, P. Jackson, and S. Siebentritt, Correcting for interference effects in the photoluminescence of Cu(In,Ga)Se2 thin films, Phys. Stat. Sol. C 14 (2017) 1600189
    DOI: 10.1002/pssc.201600189
  • M. Malitckaya, H.-P. Komsa, V. Havu, and M. J. Puska, First-principles modeling of point defects and complexes in thin-film solar-cell absorber CuInSe2, Adv. Electron. Mater. 3 (2017) 1600353
    DOI: 10.1002/aelm.201600353
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  • E. Handick, P. Reinhard, R. G. Wilks, F. Pianezzi, T. Kunze, D. Kreikemeyer-Lorenzo, L. Weinhardt, M. Blum, W. Yang, M. Gorgoi, E. Ikenaga, D. Gerlach, S. Ueda, Y. Yamashita, T. Chikyow, C. Heske, S. Buecheler, A. N. Tiwari, and M. Bär, Formation of a K-In-Se Surface Species by NaF/KF Postdeposition Treatment of Cu(In,Ga)Se2 Thin-Film Solar Cell Absorbers, ACS Appl. Mater. Interfaces 9 (2017) 3581
    DOI: 10.1021/acsami.6b11892
  • E. Avancini, R. Carron, B. Bissig, P. Reinhard, R. Menozzi, G. Sozzi, S. Di Napoli, T. Feurer, S. Nishiwaki, S. Buecheler and A. N. Tiwari, Impact of compositional grading and over all Cu deficiency on the near-infrared response in Cu(In,Ga)Se2 solar cells, Prog. Photovolt: Res. Appl. 25 (2017) 233
    DOI: 10.1002/pip.2850

2016

  • P. Jackson, R. Wuerz, D. Hariskos, E. Lotter, W. Witte, and M. Powalla, Effects of heavy alkali elements in Cu(In,Ga)Se2 solar cells with efficiencies up to 22.6%, Phys. Stat. Sol. (RRL) 10 (2016) 583
    DOI: 10.1002/pssr.201600199

Conference proceedings

2016

  • G. Sozzi, M. Lazzarini, R. Menozzi, R. Carron, E. Avancini, B. Bissig, S. Buecheler, and A. N. Tiwari, A numerical study of the use of C-V characteristics to extract the doping density of CIGS absorbers, Proceedings of the 43rd IEEE Photovoltaics Specialists conference (PVSC), Portland, OR, USA, June 5 – 10, 2016, pp. 2283 – 2288
    DOI: 10.1109/PVSC.2016.7750043
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  • G. Sozzi, S. Di Napoli, R. Menozzi, R. Carron, E. Avancini, B. Bissig, S. Buecheler, and A. N. Tiwari, Analysis of Ga grading in CIGS absorbers with different Cu content, Proceedings of the 43rd IEEE Photovoltaics Specialists conference (PVSC), Portland, OR, USA, June 5 – 10, 2016, pp. 2279 – 2282
    DOI: 10.1109/PVSC.2016.7750042
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  • E. Handick, P. Reinhard, R. G. Wilks, F. Pianezzi, R. Félix, M. Gorgoi, T. Kunze, S. Buecheler, A. N. Tiwari, and M. Bär, NaF/KF post-deposition treatment and their influence on the structure of Cu(In,Ga)Se2 absorber surfaces, Proceedings of the 43rd IEEE Photovoltaics Specialists conference (PVSC), Portland, OR, USA, June 5 – 10, 2016, pp. 0017 – 0021
    DOI: 10.1109/PVSC.2016.7749400
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