Products & Research

Projects

A selection of products, tools, and publications spanning software, app development, and scientific modeling.

Research Tool

I-V Curve Fitting

  • Photovoltaics
  • Numerical fitting
  • Executable tool

A desktop tool for fitting experimentally measured I-V data with the single-diode model and turning raw measurements into usable solar-cell parameters.

The project was built to make a technically demanding fitting workflow fast, transparent, and easy to use in practice. Experimental data can be pasted in directly, key parameters can be fitted or adjusted manually, and the result is visible immediately in both the numbers and the curve.

Research Tool

Transfer-Matrix Method

  • Optical modeling
  • Scientific software
  • Thin-film systems

A C# implementation of the transfer-matrix method for thin-film optics, built to calculate and visualize how light behaves in layered materials.

The project focuses on optical questions that matter in real devices: absorption in each layer, reflected power, and depth-dependent energy flow. It turns a mathematically dense method into a usable tool for exploring interference effects, comparing structures, and understanding multilayer systems more intuitively.

Publications

Publications

  • Research papers and theses
  • Reverse chronological order

A selection of my scientific publications.

Together, these papers and theses trace the research backbone of my work: from solid-state physics and multiphysics simulation to robust fitting methods and transferable software approaches. They are a good starting point if you want to see the scientific depth behind the products and engineering work presented on this site.

  1. M. Zinßer, T. Helder, T. Magorian Friedlmeier, A. Bauer, T. Kirchartz, U. Rau, R. Wächter, M. Powalla
    Holistic Yield Modeling, Top-Down Loss Analysis, and Efficiency Potential Study of Thin-Film Solar Modules
    Communications Physics 6, 55 (2023)
  2. M. Zinßer
    Electrical and Optical Modeling of Thin-Film Photovoltaic Modules
    PhD thesis at Karlsruhe Institute of Technology (2022)
  3. T. Helder, A. Kanevce, M. Zinßer, R. Gutzler, S. Paetel, W. Hempel, T. Magorian Friedlmeier, M. Powalla
    How small changes make a difference: Influence of low silver contents on the effect of RbF-PDT in CIGS solar cells
    Progress in Photovoltaics: Research and Applications (2022)
  4. M. Zinßer, B. Braun, T. Helder, T. Magorian Friedlmeier, B. Pieters, A. Heinlein, M. Denk, D. Göddeke, M. Powalla
    Irradiation-dependent Topology Optimization of Metallization Grid Patterns used for latitude-based Yield Gain of Thin-film Solar Modules
    MRS Advances 7, 706-712 (2022)
  5. M. Zinßer
    Numerically Robust Methodology for Fitting Current-Voltage Characteristics of Solar Devices with the Single-Diode Equivalent-Circuit Model
    arXiv:2206.13087 [physics.comp-ph] (2022)
  6. M. Zinßer, T. Helder, A. Bauer, T. Magorian Friedlmeier, J. Zillner, J.-P. Becker, M. Powalla
    Optical and Electrical Loss Analysis of Thin-film Solar Cells combining the Methods of Transfer-Matrix and Finite Elements
    IEEE Journal of Photovoltaics 12, 1154-1161 (2022)
  7. T. Helder, A. Kanevce, A. Bauer, M. Zinßer, S. Paetel, T. Magorian Friedlmeier, M. Powalla
    DLTS investigations on CIGS solar cells from an inline co-evaporation system with RbF post-deposition treatment
    EPJ Photovoltaics 17, 7 (2022)
  8. M. Zinßer, M. Loy, T. Helder, A. Bauer, T. Magorian Friedlmeier, M. Powalla
    Finite Element Simulation of Electrical Intradevice Physics of Thin-Film Solar Cells and Its Implications on the Efficiency
    IEEE Journal of Photovoltaics 12, 483-492 (2022)
  9. M. Denk, K. Rother, M. Zinßer, C. Petroll, K. Paetzold
    Nodal cosine sine material interpolation in multi objective topology optimization with the global criteria method for linear elasto static heat transfer potential flow and binary cross entropy sharpening
    Proceedings of the Design Society, 2247-2256 (2021)
  10. M. Zinßer, K. Schlegel, M. Dressel, M. Scheffler
    Role of non-linear effects and standing waves in microwave spectroscopy: Corbino measurements on superconductors and VO2
    Review of Scientific Instruments 90, 034704 (2019)
  11. M. Zinßer
    Microwave investigations on SrTiO3-based materials at mK temperatures
    Master's thesis at University of Stuttgart (2018)
  12. M. Zinßer
    Frequenz- und temperaturabhängige Mikrowelleneigenschaften supraleitender Proben in Corbino-Geometrie
    Bachelor's thesis at University of Stuttgart (2016)