Photo-Electro Induced Ferroelectricity in CH3NH3PbI3 Perovskite Solar Cells

Arie Zaban^a, Ronen Gottesman^a, Laxman Gouda^a, Eynav Haltzi^a, Filippo De Angelis^b, Edoardo Mosconi^b

^aBar Ilan University, Bar Ilan University, Ramat Gan, 52900, Israel

^bCNR-ISTM, via Elce di Sotto 8, Perugia, 06123, Italy

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

Invited Speaker Session, Ronen Gottesman, presentation 225
Publication date: 5th February 2015

Starting at 2011, organic-inorganic halide perovskites have emerged as one of the most promising competitors to silicon-based PVs. Despite a significant research effort which is evident in the constant increase of cell efficiency, the operation mechanism of this PV family is not yet resolved. In this study we presented a spectro- electro- optical study of isolated perovskite under solar cell working conditions. Thin CH3NH3PbI3 films deposited in a narrow gap between two metallic or semiconductor electrodes were examined by photoconductivity, photoluminescence, Raman and UV-visible spectroscopy, to reveal their response to solar illumination and electric fields. Our results show that exposure to both light and electric fields strongly affect the perovskite properties depending on light intensity and temperature. We identify a slow (tens of minutes), reversible structural rearrangement which intensifies the ferroelectric properties of this material (return to the original structure requires hours in the dark). The significance of the results as insight to operation mechanism and cell stability will be discussed.

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