Markus Neuschitzer

ESR 2.3 Markus Neuschitzer PhD student at IREC.

He obtained his Master’s degree in technical physics from the Graz University of Technology in 2012. During the master’s program he was abroad for one year studying in Grenoble, France, in the framework of an Erasmus student exchange program. While being there, he had the opportunity to complete a six month internship, where he investigated AlN/GaN nanostructures using different X-ray based characterization techniques. His master’s thesis was on the realization of a grazing incidence diffraction set-up using standard laboratory equipment to characterize inorganic thin films, organic monolayers and self-assembled monolayers used in organic electronic devices and inorganic thin film heterojunction solar cells. His PhD position in the KESTCELLS project is focused on chemical strategies for the synthesis of CZTSSe absorbers. His work is mainly centered on the development of routes based on spray pyrolysis under controlled atmosphere to obtain high quality CZTSSe precursors and the optimization of thermal processes to crystallize these chemical based precursors. Furthermore, he applies different surface treatments to PVD grown reference cells to improve the absorber buffer interface and to gain a deeper understanding of the junction.

The main research activities in the first months of his PhD were focused on the optimization of the growth parameters for obtaining good precursor films in spray pyrolysis. Here, especially the right temperature is the key parameter to obtain homogeneous and dense films. Furthermore, different concentrations and ratios of precursor solutions were used to optimize the composition and investigate a possible enhancement of grain growth using an initial Cu-rich growth phase followed by a Cu-poor growth phase to adjust the overall composition. By optimizing the thermal treatments sprayed CZTSSe solar cells of 1.2% efficiency could be produced. Further, he was working on possible surface modifications of reference PVD grown solar cells using different surface treatments and short reannealing. Here, the efficiencies the PVD grown cells could improve from below 2% to above 7%.

Papers:

  1. M. NEUSCHITZER, Y. Sanchez, S. López-Marino, H. Xie, A. Fairbrother, M. Placidi, S. Haass, V. Izquierdo-Roca, A. Perez-Rodriguez and E. Saucedo, Optimization of CdS buffer layer for high-performance Cu2ZnSnSe4 solar cells and the effects of light soaking: elimination of crossover and red kink, Progress in Photovoltaics Research and Applications, 2015. DOI: 10.1002/pip.2589
  2. H. Xie, Y. Sánchez, S. López-Marino, M. Espíndola-Rodríguez, J. López-García, M. NEUSCHITZER, D. Sylla, A. Fairbrother, A. Pérez- Rodríguez and E. Saucedo. Impact of Sn(S,Se) secondary phases in Cu2ZnSn(S,Se)4 solar cells: a chemical route for their selective removal and absorber surface passivation, ACS-Applied Surfaces and Interfaces, 2014. DOI:10.1021/am502609c.
  3. S. Lopez-Marino, M. NEUSCHITZER, Y. Sánchez, A. Fairbrother, M. Espíndola-Rodríguez, J. López-García, M. Placidi, L. Calvo-Barrio, A. Pérez-Rodríguez and E. Saucedo. Earth-abundant absorber based solar cells onto low weight stainless steel substrate, Solar Energy Materials and Solar Cells, 2014. DOI:10.1016/j.solmat.2014.07.030.
  4. C. Insignares-Cuello, F.Oliva, M. NEUSCHITZER, X.Fontané, C. Broussillou, T. Goislard de Monsabert, E.Saucedo, C.M. Ruiz, A Pérez-Rodríguez, V Izquierdo-Roca. “Advanced characterization of electrodeposition-based high efficiency solar cells: Non-destructive Raman scattering quantitative assessment of the anion chemical composition in Cu (In, Ga)(S, Se) 2 absorbers” Solar Energy Materials and Solar Cells, 2015, Vol 143. 212-217. 10.1016/j.solmat.2015.06.056
  5. J. Krustok, T. Raadik, M. Grossberg, S. Giraldo, M. NEUSCHITZER, S.López-Marino, E. Saucedo. “Temperature dependent electroreflectance study of Cu 2 ZnSnSe 4 solar cells.” Materials Science in Semiconductor Processing. 2015. Vol 39 251-254. 10.1016/j.mssp.2015.04.055.
  6. M. NEUSCHITZER, Y. Sánchez, T. OLAR, T Thersleff, S López-Marino, F Oliva, M Espindola-Rodriguez, H. Xie, Ml Placidi, V Izquierdo-Roca, I Lauermann, K Leifer, A. Perez-Rodriguez, E Saucedo “The complex surface chemistry of kesterites: Cu/Zn re-ordering after low temperature post deposition annealing and its role in high performance devices”. “Chemistry of Materials”, 2015, 27(15), pp. 5279-5287. 10.1021/acs.chemmater.5b01473
  7. M. Placidi, M. DIMITRIEVSKA, V. Izquierdo-Roca,  X. Fontané,  A. Castellanos-Gomez, A. Pérez-Tomás,  N. Mestres, M. Espindola-Rodriguez, S. López-Marino, M. NEUSCHITZER, V. Bermudez,  A.M Yaremko and A. Pérez-Rodríguez, “Multiwavelength excitation Raman scattering analysis of bulk and 2 dimensional MoS2: Vibrational properties of atomically thin MoS2 layers”, 2D Mater., vol. 2, p. 035006, 2015.
  8. S. Giraldo, M NEUSCHITZER, T. Thersleff, S. López‐Marino, Y. Sánchez, H. Xie, M. Colina, M. Placidi, P. Pistor, V. Izquierdo‐Roca, K. Leifer, A. Pérez‐Rodríguez, E. Saucedo. Large Efficiency Improvement in Cu2ZnSnSe4 Solar Cells by Introducing a Superficial Ge Nanolayer. Advanced Energy Materials. 2015. 10.1002/aenm.201501070.
  9. Y. Sanchez, M. NEUSCHITZER, M. DIMITRIEVSKA, M. Espindola-Rodriguez, J. Lopez-Garcia, V. Izquierdo-Roca, O. Vigil-Galan, and E. Saucedo, “High VOC Cu2ZnSnSe4/CdS:Cu based solar cell: Evidences of a metal-insulator-semiconductor (MIS) type hetero-junction,” in Photovoltaic Specialist Conference (PVSC), 2014 IEEE 40th, pp. 0417-0420,2014.
  10. J. Márquez, M. NEUSCHITZER, M. Dimitrievska, R. Gunder,, S. Haass, M. Werner, Y.E. Romanyuk, S. Schorr,N.M. Pearsall, I. Forbes Systematic compositional changes and their influence on lattice and optoelectronic properties of Cu2ZnSnSe4 kesterite solar cells. Solar Energy Materials and Solar Cells, 2016, Vol 144. Pp 579-585. doi:10.1016/j.solmat.2015.10.004
  11. M. Neuschitzer, K. Lienau, M. Guc, L. C. Barrio, S. Haass, J. M. Prieto, Y. Sanchez, M. Espindola-Rodriguez, Y. Romanyuk, A. Perez-Rodriguez, Victor Izquierdo-Roca, E. Saucedo,”Towards high performance Cd-free CZTSe solar cells with a ZnS(O,OH) buffer layer: the influence of thiourea concentration on chemical bath deposition “, Journal of Physics D: Applied Physics,  Volume 49,  Number 12, 2016 DOI: 10.1088/0022-3727/49/12/125602
  12. A. Fairbrother, M. NEUSCHITZER, E. Saucedo, A. Pérez‐Rodríguez. “Zn‐poor Cu2ZnSnSe4 thin films and solar cell devices”, Physica status solidi (a), Vol.212, Issue 1, 109-115, (2015). DOI:10.1002/pssA.201431408
  13. T. OLAR, I. Lauermann, H. Xie, M. NEUSCHITZER, E. Saucedo, W. Calvet, A.r Steigert, B. Ümsür, B. Chacko, V. Parvan, M. Gorgoi, B. Senkovskiy, M.Ch Lux-Steiner. “Assessment of Chemical and Electronic Surface Properties of the Cu 2 ZnSn (SSe) 4 After Different Etching Procedures by Synchrotron-based Spectroscopies”, Energy Procedia, Vol.84, 080-016, (2015). DOI:10.1016/j.egypro.2015.12.289
  14. S. López-Marino, Y. Sánchez, M. Espíndola-Rodríguez, X. Alcobé, H. Xie, M. NEUSCHITZER, I. Becerril, S. Giraldo, M. Dimitrievska, M.l Placidi, L. Fourdrinier, V. Izquierdo-Roca, A. Pérez-Rodríguez, E. Saucedo “Alkali doping strategies for flexible and light-weight Cu 2 ZnSnSe 4 solar cells”, Journal of Materials Chemistry A, (2016). DOI:10.1039/C5TA09640E
  15. M. Guc, M. NEUSCHITZER, D. Hariskos, A. Bauer, W. Witte, W. Hempel, L. Calvo-Barrio, P. Pistor, A. Perez-Rodriguez, V. Izquierdo-Roca “Raman scattering quantitative assessment of the anion composition ratio in Zn (O, S) layers for Cd-free chalcogenide based solar cells”, RSC Advances, (2016). DOI:10.1039/C5RA26261E
  16. Y. Sánchez, M. Espíndola-Rodríguez, H. Xie, S. López-Marino, M. NEUSCHITZER, S. Giraldo, M. Dimitrievska, M. Placidi, V. Izquierdo-Roca, F.A. Pulgarín-Agudelo, O. Vigil-Galán, E. Saucedo “Ultra-thin CdS for highly performing chalcogenides thin film based solar cells”, Solar Energy Materials and Solar Cells, (2016). DOI:0.1016/j.solmat.2015.12.037
  17. E. Kask, J. Krustok, S. Giraldo, M. NEUSCHITZER, S. López-Marino, E. Saucedo. “Temperature dependent electrical characterization of thin film Cu2ZnSnSe4 solar cells”, Journal of Physics D: Applied Physics, Vol.49, Issue 8, 85101, (2016). DOI:10.1088/0022-3727/49/8/085101
  18. H. Xie, S. López-Marino, T. Olar, Y. Sánchez González, M. NEUSCHITZER, Florian Oliva, S. Giraldo, V. Izquierdo-Roca, I. Lauermann, A. Pérez-Rodríguez, E. Saucedo “On the Impact of Na Dynamics at the Cu2ZnSn (S, Se) 4/CdS Interface During Post Low Temperature Treatment of Absorbers”, ACS applied materials & interfaces, (2016). DOI:10.1021/acsami.5b12243
  19. M. NEUSCHITZER, J. Marquez, S. Giraldo, M. Dimitrievska, M.Placidi, I. Forbes, V. Izquierdo-Roca, A. Pérez-Rodriguez, E. Saucedo “Voc Boosting and Grain Growth Enhancing Ge-Doping Strategy for Cu2ZnSnSe4 Photovoltaic Absorbers”, Journal of Physical Chemistry C, Vol.120, Issue 18, 9661-9670, (2016). DOI:10.1021/acs.jpcc.6b02315
  20. S. Lopez-Marino, M. Espíndola-Rodríguez, Y. Sánchez, X. Alcobé, F. Oliva, H. Xie, M. NEUSCHITZER, S. Giraldo, M. Placidi, R. Caballero, V. Izquierdo-Roca, A. Pérez-Rodríguez, E. Saucedo “The Importance of Back Contact Modification in Cu2ZnSnSe4 Solar Cells: The Role of a Thin MoO2 Layer”, Nano Energy , (2016). DOI:10.1016/j.nanoen.2016.06.034
  21. M. Placidi, M. Espindola-Rodriguez, S. Lopez-Marino, Y. Sanchez, S. Giraldo, L. Acebo, M. NEUSCHITZER, X. Alcobé, A. Pérez-Rodríguez, E. Saucedo “Effect of Rapid Thermal Annealing on the Mo Back Contact Properties for Cu2ZnSnSe4 Solar Cells”, J. Alloys Compd, Vol.675, 158-162, (2016). DOI:
  22. M. Espindola-Rodriguez, Y. Sanchez, S. López-Marino, D. Sylla, M. Placidi, M. NEUSCHITZER, H. Xie, V. Izquierdo-Roca, O. Vigil-Galán, E. Saucedo. “Selenization of Cu2ZnSnS4 Thin Films Obtained by Pneumatic Spray Pyrolysis”, J. Anal. Appl. Pyrolysis , (2016). DOI:10.1016/j.jaap.2016.04.008
  23. S. Giraldo, T. Thersleff, G. Larramona, M. NEUSCHITZER, P. Pistor, K. Leifer, A. Pérez-Rodríguez, C. Moisan, G. Dennler and E. Saucedo “Cu2ZnSnSe4 solar cells with 10.6% efficiency through innovative absorber engineering with Ge superficial nanolayer”, PROGRESS IN PHOTOVOLTAICS: RESEARCH AND APPLICATIONS, (2016). DOI:10.1002/pip.2797
  24. S. Giraldo, M. NEUSCHITZER, M. Placidi, P. Pistor, A. Pérez-Rodríguez, and E. Saucedo “Cu2ZnSnSe4-Based Solar Cells With Efficiency Exceeding 10% by Adding a Superficial Ge Nanolayer: The Interaction Between Ge and Na”, IEEE JOURNAL OF PHOTOVOLTAICS, Vol.6, Issue 3, 754-759, (2016). DOI:10.1109/JPHOTOV.2016.2535236
  25. D. Cozza , C. M. Ruiz , D. Duche , M. Neuschitzer , E. Saucedo , J. J. Simon , L. Escoubas “1D and 2D numerical simulations of Cu2ZnSnSe4 solar cells”, 2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) DOI:10.1109/PVSC.2015.7355795
  26. M. Espindola-Rodriguez , Y. Sanchez , S. Lopez-Marino , H. Xie , V. Izquierdo-Roca , D. Sylla , M. Neuschitzer , O. Vigil-Galan , E. Saucedo , M. Placidi “Efficient bifacial Cu2ZnSnSe4 solar cells”, 2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) DOI:10.1109/PVSC.2015.7355903
  27. S. Giraldo , M. Neuschitzer , S. Lopez-Marino , Y. Sanchez , H. Xie , M. Colina , M. Placidi , P. Pistor , V. Izquierdo-Roca , A. Perez-Rodriguez , E. Saucedo “Large performance improvement in Cu2ZnSnSe4 based solar cells by surface engineering with a nanometric Ge layer”, 2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) DOI:10.1109/PVSC.2015.7356377
  28. M. Placidi , M. Espindola-Rodriguez , S. Lopez-Marino , Y. Sanchez , M. Neuschitzer , V. Izquierdo Roca , X. Fontane , Xavier Alcobe , A. Perez-Rodriguez , E. Saucedo “Cu2ZnSnSe4 based solar cells prepared at high temperatures on Si/SiO2 sodium-free substrate”, 2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) DOI:10.1109/PVSC.2015.7356361
  29. S. Lugo , Y. Sánchez , M. Neuschitzer , H. Xie , C. Insignares-Cuello , V. Izquierdo-Roca , Y. Peña , E. Saucedo, “Chemical bath deposition route for the synthesis of ultra-thin CuIn(S,Se)2 based solar cells”, Thin Solid Films, Vol. 582, 74-78,(2015) DOI:10.1016/j.tsf.2014.10.039

Conferences:

  1. C.M C.M Ruiz, A. Moreau, D. Cozza, P. di Lauro, J.J.Simon, L. Escoubas, M. Neuschitzer, A. Fairbrother, E. Saucedo and V. Bermúdez”Exploring the potential of photoreflectance in Cu2ZnSnS4 solar cells. Presented at4th European Kesterite Workshop. Berlin, Germany. (Oral)
  2. M. Neuschitzer, M. Placidi, S. López-Marino , H. Xie, V. Iglesias, A. Pérez-Tomás, A. Bayerl, A. Fairbrother, V.Izquierdo-Roca, A. Pérez-Rodríguez, E. Saucedo”Strong efficiency increase of kesterite based solar cells under low illumination conditions. Presented at4th European Kesterite Workshop. Berlin, Germany. (Oral)
  3. S. Lopez-Marino, M. Neuschitzer, Y. Sánchez, A. Fairbrother, M. Espindola-Rodriguez, J. López-García, M. Placidi, L. Calvo-Barrio, A. Pérez-Rodríguez, and E. Saucedo”Development of Cu2ZnSnSe4 based solar cells onto low weight stainless steel substrates. Presented at4th European Kesterite Workshop. Berlin, Germany. (Poster)
  4. “C.M.Ruiz, A.Moreau, J.J.Simon, L. Escoubas,S. López-Mariño, M. Neuschitzer, A. Fairbrother, E. Saucedo
    and V. Bermúdez””Understanding Ordering/Disordering in Kesterites Structure Through Photoreflectance. Presented atPVTC – Photovoltaic Technical conference. Aix-en-Provence, France. (Oral)
  5. C.M.Ruiz, A.Moreau, J.J.Simon, M. Neuschitzer, E. Saucedo and L. Escoubas”Analysis of Cu2ZnSnSe4/CdS junction interface by photoreflectance . Presented at5th European Kesterite Workshop. Tallin, Estonia. (Oral)
  6. J. Márquez, M. Neuschitzer, S. Haass, M. Werner, Y. Romanyuk and I. Forbes “Influence of the Cu Content on CZTSe Thin Film Solar Cells . Presented at5th European Kesterite Workshop. Tallin, Estonia. (Oral)
  7. M. Neuschitzer, Y. Sanchez, S. López-Marino, H. Xie, J. López-García, M. Placidi, V. Izquierdo-Roca, A. Perez-Rodriguez and E. Saucedo”Optimization of CdS Buffer Layers for Improved CdS/Cu2ZnSnSe4 Hetero-Junctions with 8.2% Efficiency . Presented atEU PVSEC. Amsterdam, Netherlands. (Oral)
  8. M. Neuschitzer, F. Oliva, T. Olar, S. López-Marino, M. Espindola-Rodriguez, Y. Sánchez, V. Izquierdo-Roca, I. Lauermann, A. Perez-Rodriguez, and E. Saucedo”The complex surface chemistry of kesterites: Cu/Zn re-ordering after low temperature re-annealing and its role in high performance devices. Presented at5th European Kesterite Workshop. Tallin, Estonia. (Oral)
  9. M. Neuschitzer, M. Placidi, S. López-Marino , H. Xie, V. Iglesias, A. Pérez-Tomás, A. Bayerl, A. Fairbrother, V.Izquierdo-Roca, A. Pérez-Rodríguez, E. Saucedo”Role of grain boundaries in the performance of Cu2ZnSn(S1-ySey)4 (0≤y≤1) based solar cells under low illumination conditions. Presented atMRS-Spring Meeting. San Francisco, USA. (Oral)
  10. M. Placidi, A. Pérez-Tomás, X. Fontané, M. Sledzinska, M. Neuschitzer, S. López-Marino, M. Espíndola-Rodríguez, A. Fairbrother, V. Izquierdo-Roca, A. Pérez-Rodríguez, and E. Saucedo”Nanoscale scanning probe analysis of heterojunction MoS2-based diodes for solar energy conversion. Presented atMRS-Spring Meeting. San Francisco, USA. (Poster)
  11. S. Lopez-Marino, M. Neuschitzer, Y. Sánchez, A. Fairbrother, M. Espindola-Rodriguez, J. López-García, M. Placidi, L. Calvo-Barrio, A. Pérez-Rodríguez, and E. Saucedo”Development of Cu2ZnSnSe4 based solar cells onto low weight stainless steel substrates. Presented atMRS-Spring Meeting. San Francisco, USA. (Poster)
  12. S. Lugo, Y. Sánchez, M. Neuschitzer, H. Xie, C. Insignares-Cuello, V. Izquierdo-Roca, Y. Peña, E. Saucedo”CuInSe2 based solar cells prepared by selenization o chemical bath deposited In2S3/CuxSe stacks. Presented atE-MRS Spring Meeting. Lille, France. (Poster)
  13. Y. Sánchez, M. Neuschitzer, M. Dimitrievska, M. Espíndola-Rodríguez, J. López-García, V. Izquierdo-Roca, O. Vigil-Galán, E. Saucedo”High VOC Cu2ZnSnSe4/CdS:Cu based solar cell: evidences of a Metal-Insulator-Semiconductor (MIS) type hetero-junction. Presented atIEEE PVSC. Denver, USA. (Poster)
  14. Y. Sánchez, M. Neuschitzer, S. López-Marino, V. Izquierdo-Roca, L. Calvo-Barrio, O. Vigil-Galán, A. Pérez-Rodríguez, E. Saucedo”Soft thermal processing of Cu2ZnSnSe4/CdS hetero-junction for solar cell efficiency improvement. Presented atE-MRS Spring Meeting. Lille, France. (Oral)
  15. C. M. Ruiz Herrero, A. Moreau, M. Neuschitzer, J. J. Simon, E. Saucedo and L. Escoubas”Analysis of Cu2ZnSnSe4/Cds Junction Interface by Photoreflectance . Presented atMRS-Spring Meeting. San Francisco, USA. (Poster)
  16. D. Cozza, C.M. Ruiz, D. Duché, M. Neuschitzer, E. Saucedo, J.-J. Simon, L. Escoubas”Buffer and window layers thickness optimization of Cu2ZnSnSe4 solar cells by numerical simulation. Presented atNEXTGEN NANO PV 2015. Menorca, Spain. (Oral)
  17. D. Cozza, C.M. Ruiz,D.Duché,M. Neuschitzer, E. Saucedo, J.J. Simon, L. Escoubas: “1D and 2D numerical simulations of Cu2ZnSnSe4solar cells. Presented atNextgen NanoPV 2015. Mahon, Spain. (Oral)
  18. H. Xie, Y. Sánchez, M. Dimitrievska, X. Fontané, S. López-Marino, M. Neuschitzer, M. Espíndola-Rodríguez, V. Izquierdo-Roca, A. Pérez-Rodríguez, E. Saucedo”Preparation of high efficiency Cu2ZnSn(S1-ySey)4 solar cells based on a single-step sulfo-selenization process. Presented atNEXTGEN NANO PV 2015. Menorca, Spain. (Poster)
  19. J. Márquez, M. Neuschitzer, M. Dimitrievska, S. Haass, M. Werner, Y.E. Romanyuk, N. Pearsall and I. Forbes”Influence of the Cu Content on Sputtered CZTSe Thin Film Solar Cells. Presented atMRS-Spring Meeting. San Francisco, USA. (Poster)
  20. M. Espindola, M. Placidi, Y. Sánchez, D. Sylla, S. López-Marino, M. Neuschitzer, O. Vigil-Galán, A. Pérez-Rodríguez, E. Saucedo”Transparent conducting back contacts for bifacial Cu2ZnSnSe4 solar cells. Presented atNEXTGEN NANO PV 2015. Menorca, Spain. (Poster)
  21. M. Espindola-Rodriguez, M. Placidi1, Y. Sánchez, S. López-Marino, D.Sylla, M. Neuschitzer, V. Izquierdo-Roca, O. Vigil-Galán, A. Pérez-Rodríguez and E. Saucedo “Bifacial Cu2ZnSnSe4 thin film solar cells. Presented atE-MRS Spring Meeting. Lille, France. (Poster)
  22. M. Neuschitzer, K. Lienau, S. Haas, J. M. Prieto, Y. Sanchez, Y. Romanyuk, A. Perez-Rodriguez, and E. Saucedo”Towards high performance Cd-free CZTSe solar cells with ZnS(O,OH) buffer layer: The influence of the thiourea concentration during CBD. Presented atMRS-Spring Meeting. San Francisco, USA. (Poster)
  23. M. Neuschitzer, S. Giraldo, Y. Sanchez, S. Lopez-Marino, H. Xie, M. Placidi, A. Pérez-Rodriguez, E. Saucedo”VOC boosting Ge-doping strategies for Cu2ZnSnSe4 absorbers. Presented at6th european kesterite workshop. Newcastle, UK. (Oral)
  24. M. Neuschitzer, T. Olar, F. Oliva, Y. Sánchez, S. López-Marino, M. Espindola-Rodriguez, M. Placidi, V. Izquierdo-Roca, I. Lauermann, A. Perez-Rodriguez, and E. Saucedo”The complex surface chemistry of kesterites: Cu/Zn re-ordering after low temperature re-annealing and its role in high performance devices . Presented atNEXTGEN NANO PV 2015. Menorca, Spain. (Oral)
  25. M. Neuschitzer, T. Thersleff, S. Giraldo, Y. Sánchez, S. López-Marino, M. Placidi, K.Leifer, A. Perez-Rodriguez, and E. Saucedo”The effects of tailored surface and grain boundary passivation routes for high efficient kesterites solar cells revealed by advanced transmission electron microscopy techniques. Presented atThe 2nd International Workshop on TEM Spectroscopy in the Materials Sciences. Uppsala, Sweden. (Oral)
  26. S. Giraldo, M. Neuschitzer, S. López-Marino, Y. Sanchez, H. Xie, M. Colina, M. Placidi, P. Pistor, V. Izquierdo-Roca, A. Pérez-Rodríguez, and E. Saucedo”Large performance improvement in Cu2ZnSnSe4 based solar cells by surface engineering with a nanometric Ge layer . Presented atIEEE. New Orleans, USA. (Poster)
  27. S. Giraldo, M. Neuschitzer, T. Thersleff, S. López-Marino, Y. Sanchez, M. Colina, M. Placidi, P. Pistor, L. Calvo-Barrio, V. Izquierdo-Roca, K. Leifer, A. Pérez-Rodríguez, and E. Saucedo”10.6% efficiency Cu2ZnSnSe4 solar cells through a novel absorber engineering with Ge optimizing the VOC. Presented atEU-Pvsec. Hamburg, Germany. (Oral)
  28. S. Giraldo, T. Thersleff, M. Neuschitzer, P. Pistor, K. Leifer, A. Pérez-Rodríguez, E. Saucedo”Cu2ZnSnSe4 based solar cells with efficiency exceeding 10% by adding a superficial Ge nanolayer. Presented at PVSEC-25 . Korea. (Oral Invited)
  29. S. López-Marino, M. Espíndola-Rodríguez, Y. Sánchez, M. Neuschitzer, H. Xie, M. Placidi, V. Izquierdo-Roca, E. Saucedo”The importance of back contact modification in high efficiency Cu2ZnSnSe4 solar cells: the role of a thin MoO2 layer. Presented atNEXTGEN NANO PV 2015. Menorca, Spain. (Oral)
  30. S. Lopez-Marino, M. Espindola-Rodriguez, Y. Sanchez, M. Neuschitzer,H. Xie, M. Placidi, V. Izquierdo-Roca and E. Saucedo”The Importance of Back Contact Modification in High Efficiency Cu2ZnSnSe4 Solar Cells: The Role of a Thin MoO2 Layer. Presented atMRS-Spring Meeting. San Francisco, USA. (Poster)
  31. S. López-Marino, Y. Sanchez, M. Espíndola-Rodríguez, M. Neuschitzer, H.Xie, M. Placidi, M. Dimitrievska, V. Izquierdo-Roca, L. Fourdrinier, E. Saucedo”Alkali doping strategies for flexible and light-weight CZTSe solar cells. Presented atE-MRS Spring Meeting. Lille, France. (Poster)
  32. T. Thersleff, S. Giraldo, M. Neuschitzer, E. Saucedo, K. Leifer, “Spatial correlation of structure / composition trends in Cu2ZnSnSe4-based solar cells with sub-nanometer resolution. Presented atMRS Fall meeting. Boston, US. (Oral)
  33. Y. Sanchez, M. Espindola-Rodriguez, S. Lopez-Marino, M. Neuschitzer, H. Xie, F. Pulgarin-Agudelo, V. Izquierdo-Roca, O. Vigil-Galan and E. Saucedo”Ultra-Thin CdS Buffer Layer for Highly Performing Chalcogenide Based Solar Cells. Presented atMRS-Spring Meeting. San Francisco, USA. (Poster)
  34. M. Neuschitzer, M.Espindola-Rodrigez, M. Guc, J.Marquez, S.Giraldo, T.Olar, I. Lauerman, I. Forbes, A. Pérez-Rodríguez, E. Saucedo”Revealing the beneficial effects of Ge doping on Cu2ZnSnSe4 thin film solar cells. Presented at32nd European Photovoltaic Solar Energy Conference and Exhibition . München, Germany. (Oral)
  35. M. Neuschitzer, S. Giraldo, J. Marquez, M. Dimitrievska, M.Placidi, I. Forbes, V. Izquierdo-Roca, A. Pérez-Rodriguez, E. Saucedo”Enhancing grain growth and boosting Voc in CZTSe absorber layers – is Ge doping the answer?. Presented at43rd IEEE PVSC . Portland USA. (Oral)