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Perovskite Solar Cells

Hybrid organic-inorganic perovskite solar cells, due to their high efficiency and cost-effective production, are gaining worldwide attention in current photovoltaic research. The possibility to adapt a band gap of the absorber material by means of chemical modification and to produce semitransparent solar cells makes perovskite solar cells a promising technology in the field of new solar cells.

 

 

Perowskit-Modul basierend auf einer rakelbeschichteten Absorberschicht

Due to the low process temperature, the wet-chemical process used at the FMF for production of perovskite absorber layers is potentially suitable for production of solar cells on film substrates, thus providing access to large-area, flexible perovskite modules. The spin coating method used to produce such modules for small-area solar cells is not suitable. Therefore, we are working on coating processes which are in principle compatible with continuous production processes and investigate the influence of drying conditions on perovskite layer morphology and solar cells efficiency. In addition, we are investigating possibilities for the production of solar cells and modules on flexible substrates as well as large surfaces (> 100 cm²).

This work takes place in cooperation with the Fraunhofer Institute for Solar Energy Systems ISE.

Photo: Perovskite photovoltaic module with blade coated absorber layer (© FMF / Fraunhofer ISE))

 

Selected research goals are:

  • Optimization of solar cells by varying the chemical composition of the perovskite layer and the charge-carrier-selective layers
  • Development of scalable cell and modular architectures
  • Scaling up of optimized solar cells to large-scale perovskite modules
  • Production of flexible perovskite solar cells and modules
  • Optoelectric simulation of solar cells
  • In-depth characterization of optical and electronic properties by transient and steady state methods such as electro- and photoluminescence, CELIV, TDCF
  • Structural investigations by X-ray diffraction (XRD) and scanning electron microscopy (SEM)
  • Aging tests by heat, continuous lighting and outdoor exposure