Accelerated stability assessment of perovskite photovoltaic materials with concentrated sunlight

Baili Li^a, Ravi K. Misra^a, Eugene A. Katz^a^,^c, Iris Visoly-Fisher^a^,^c, Sigalit Aharon^b, Lioz Etgar^b, Dmitri Mogilyanski^c

^aDept. of Solar Energy and Environmental Physics, Swiss Institute for Dryland Environmental and Energy Research, Jacob Blaustein Institute for Desert Research, Ben Gurion University, Sede Boker Campus, Sede Boker, 84990

^bCasali Center for Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904

^cIlse Katz Institute for Nanoscale Science & Technology, Ben Gurion University of the Negev, Beer Sheva, 84105

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Oral, Ravi K. Misra, presentation 071
Publication date: 5th February 2015

The talk reports an accelerated degradation testing of MAPbX₃ films (X = I or Br) by exposure to concentrated sunlight of 100 suns. We present that the evolution of light absorption and the corresponding structural modifications are dependent on the type of halide ion and the sample temperature [1]. The degradation in absorption of MAPbI₃ films after exposure to 100 suns for 60 minutes at elevated sample temperature (~45-55^oC), due to decomposition of the hybrid perovskite material, has been demonstrated. No degradation was observed after exposure to the same sunlight concentration but at a lower sample temperature (~25^oC). We therefore postulate that the observed degradation is induced/accelerated by a combined effect of light and heat during concentrated sunlight exposure and is possibly related to penetration of ambient species to the encapsulated samples. No photobleaching or decomposition of MAPbBr₃filmswere recorded after exposure to similar stress conditions (light intensity, dose, and temperatures). The better stability of MAPbBr3 perovskite films can be related to differences in bond strengths and in crystalline forms between the two perovskites.

1. Misra, R. K.; Aharon, S.; Li, B.; Mogilyanski, D.; Visoly-Fisher, I.; Etgar, L.; Katz, E. A. Temperature- and Component-Dependent Degradation of Perovskite Photovoltaic Materials under Concentrated Sunlight. J. Phys. Chem. Lett. 2015, 6, 326−330.

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