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Dr. Harald Hoppe

Head of Group

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Ihre Position




Analysis via Imaging Methods and Simulations in OPV

granting institutionBMBF
grant number03EK3502
project duration01.09.2012 - 31.08.2016
project typejunior research unit
associated partnersPolyIC, ISRA Vision
project staff5


The BMBF-project "Analytik mittels Imaging Methoden und Simulationen in der OPV - AIMS in OPV" was launched at TU Ilmenau in September 2012 and addresses the advancement of imaging characterization and analysis for a maturing OPV technology. 

Project objectives:

  • Unambiguous detection of various local deficiencies within thin film organic photovoltaic devices
  • Advanced quantitative analysis of imaging data for improved information extraction
  • Complementary simulations for improved experimental data analysis
  • Advancement of imaging techniques by further developing


  • lock-in thermography
  • luminescence imaging
  • laser beam induced current
  • simulation of laterally extended devices

Four different images the very same polymer solar cell recorded by electroluminescence imaging (ELI), photoluminescence imaging (PLI), laser beam induced current (LBIC) and dark lock-in thermography (DLIT). The structures, in this case induced by different morphological compositions within the photoactive layer of the device, are noticeable in each image, although each method probes a different physical behavior of the device. The combination of all information allows for conclusions about the local morphological composition of the photoactive layer without destructive testing.


Simulated maximum module power conversion efficiency for a polymer solar module on three different substrate-transparent front contact variations --- based on the classical material system P3Ht:PCBM----. The cell length is defined with respect to current flow direction and the cell distance as the space between two neighboring serially connected cells. [1]



[1] H. Hoppe, M. Seeland, and B. Muhsin, "Optimal geometric design of monolithic thin-film solar modules: Architecture of polymer solar cells", Solar Energy Materials & Solar Cells 97, 119 (2012)

[2] R. Roesch, D. Tanenbaum, M. Jorgensen et al., “Investigation of the degradation mechanisms of a variety of organic photovoltaic devices by combination of imaging techniques—the ISOS-3 inter-laboratory collaboration”, Energy & Environmental Science 5, 6521 (2012)

[3] M. Seeland, R. Rösch, and H. Hoppe, “Luminescence imaging of polymer solar cells: Visualization of progressing degradation,” Journal of Applied Physics, 109, 064513 (2011).

[4] M. Seeland, R. Rösch, and H. Hoppe, “Quantitative Analysis of Electroluminescence Images from Polymer Solar Cells,” Journal of Applied Physics, 111, 024505 (2012).

[5] R. Rösch, F. C. Krebs, D. M. Tanenbaum et al., “Quality control of roll-to-roll processed polymer solar modules by complementary imaging methods,” Solar Energy Materials and Solar Cells, 97, 176-180 (2012).

[6] D. M. Tanenbaum, H. F. Dam, R. Rosch et al., “Edge sealing for low cost stability enhancement of roll-to-roll processed flexible polymer solar cell modules,” Solar Energy Materials and Solar Cells, 97, 157-163 (2012).

[7] R. Rösch, K.-R. Eberhardt, G. Gobsch et al., “Polymer solar cells with enhanced lifetime by improved electrode stability”, Solar Energy Materials and Solar Cells, 117, 59-66 (2013).

[8] H. Klumbies, M. Karl, M. Hermenau et al., “Water ingress into climate dependent lifetime of organic photovoltaic cells investigated by calcium corrosion tests”, Solar Energy Materials and Solar Cells, 120, 685-690 (2014).

[9] M. Seeland, R. Rösch, and H. Hoppe, “Imaging Techniques for Studying OPV Stability and Degradation” Buchkaiptel in “Stability and Degradation of Organic and Polymer Solar Cells” ed. by F. Krebs, Wiley (2012), ISBN 978-1-119-95251-0.