TEMPERATURE EFFECTS IN ACCELETATED DEGRADATION ASSESSMENT OF PEROVSKITE PHOTOVOLTAIC MATERIALS AND DEVICES WITH CONCENTRATED SUNLIGHT

Renjun Guo 1 Mark Khenkin 1 Ashwin Ambrose 1 Iris Visoly-Fisher 1,2 Eugene A. Katz 1,2
1Department of Solar Energy and Environmental Physics, Jacob Blaustein Institute for Desert Research, Ben-Gurion University of the Negev, Beer-Sheva, Israel
2Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva, Israel

Halide perovskite photovoltaics (HaPPV) are among most promising emerging PV technologies. Advantages of this technology include low cost and compositional flexibility. HaPPVs have reached Power Conversion Efficiency of 22.1% which is already competitive with silicon PV technology. However, a significant challenge facing the development of HaPPV is combining high efficiency and operational stability. To study the stability, acceleration degradation tests are of vital importance. Recently, it was suggested to use concentrated sunlight for this purpose1-2.

The sample temperature rise due to absorption of concentrated sunlight is a fundamental problem in the context of accelerated degradation testing which becomes more problematic with increased light intensities and acceleration ratios. The consequences of this problem are: (a) The acceleration factor can be nonlinear (dependent on light intensity)3, which complicates comparison of the results obtained at various light intensities even for the same exposure dose; (b) It complicates separation between light induced degradation mechanisms and those controlled by the cell temperature.

Our work is focused on measuring and controlling the sample temperature under concentrated sunlight as well as on studying the temperature effect on the degradation processes of HaPPV materials and devices. We measured the sample temperature under concentrated sunlight (up to 1,000 suns) as a function of light intensity, spectrum and flux distribution as well as of the HaPPV sample structure, composition and thickness. Finally, effects of temperature on the degradation mechanisms and rates of HaPPV materials is discussed.

References:

  1. Misra, et. al, J. Phys. Chem. Lett., 6, 326 (2015).
  2. Misra, et. al, ChemSusChem, 9, 2572 (2016).
  3. Visoly-Fisher, et. al, Sol.Energy Mat. Sol. Cells, 134, 99 (2015).








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