Study of perovskite solar cells synthesized under ambient conditions and of the possibility of their upscaling

Vijay Kumar Challuri^a, Georgia Sfyri^a^,^b, Lianos Panagiotis^a^,^c

^aFORTH/ICE-HT, Institute of Chemical engineering sciences, Lab no 216,FORTH/ICE-HT,, patras, 26504, Greece

^bUniversity of Patras, Department of Physics, 26500 Patras, Greece

^cDepartment of Chemical Engineering, University of Patras, 26500 Patras, Greece

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

Poster, Georgia Sfyri, 303
Publication date: 5th February 2015

Organometallic halide perovskite solar cells have made rapid progress in the recent years. The first perovskite sensitizer was utilized to replace the dye in DSSC¹. In the last three years perovskite based solar cell efficiencies have surpassed 17-19.3%^2-4using spiro-MeOTAD as the hole transporting material. In the present work, the cells were made and studied under ambient conditions of mild humidity with maximum efficiency 7%⁵. The electric characteristics of the cells were monitored for several days without encapsulation. The cell underwent an incubation period and demonstrated a satisfactory stability over a period of 18 days with about 15% loss of current. An upscaling endeavor was made by connecting several unit cells of 15 mm²each in parallel and in series. Connection in parallel increased current but not correspondingly to a single unit cell. However, connection in series did provide a voltage multiplication. The results encourage construction of solid state perovskite solar cells under ambient conditions of mild humidity and upscaling by connection in series.
Figure: Chemical structure of spiro-MeOTAD, photograph of a solar cell module comprising several unit cells each of 15 mm2 area and schematic diagram of materials deposition.
1. Kojima, A. et al. Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic Cells, J. Am. Chem. Soc., 2009, 131 (17),6050–6051 2. Im J.-H. et al. Growth of CH3NH3PbI3 cuboids with controlled size for high-efficiency perovskite solar cells. Nat. Nanotechnol. , 2014, 9 (11), 927-932 3.Huanping Z. et al. Interface engineering of highly efficient perovskite solar cells, Science 2014 , 345, 542-546 4.Mingzhen L. et al. Efficient planar heterojunction perovskite solar cells by vapour deposition, Nature 2013, 501,395–398. 5. Sfyri G.et al. Study of perovskite solar cells synthesized under ambient conditions and of the performance of small cell modules. (Solar Energy Materials and Solar Cells 2015, in press) Acknowledgement This research has been co-financed by the European Union (European Social Fund – ESF) and Greek national funds through the Operational Program "Education and Lifelong Learning" of the National Strategic Reference Framework (NSRF) - Research Funding Program: Thales MIS 377756. Investing in knowledge society through the European Social Fund.

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