Temperature dependence of hole conductor free formamidinium lead iodide perovskite based solar cells

Amit Rotem^a, Sigalit Aharon^a, Alexander Dymshits^a

^aInstitute of Chemistry, Hebrew University of Jerusalem, Givat Ram, david simony 34, Jerusalem, Israel

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, Sigalit Aharon, 376
Publication date: 5th February 2015

Organo metal halide perovskite is a promising material in photovoltaic (PV) cells. Within a short time, its performance has increased dramatically to become a real competitor to silicon solar cells. Here we report on temperature dependence (annealing temperature and the dependence of the photovoltaic parameters on temperature) of formamidinuim (FA) lead iodide (FAPbI₃), methylammonium (MA) lead iodide (MAPbI₃) and their mixture (MAPbI₃:FAPbI₃) in a hole conductor free perovskite solar cells. These three types of perovskites function both as a light harvester and as a hole conductor. Surface photovoltage and optical characterization reveal the p-type behavior and the band gap of the different perovskites. We observed that the ratio between the MA to FA cations might change during the annealing process, affecting the band gap and the stability of the layers. The PV parameters at different temperatures show better stability for the pure MAPbI₃ and FAPbI₃ solar cells compared to their mixture. Using intensity modulated photovoltage/photocurrent spectroscopy, we found that the diffusion length is weakly dependent on the light intensity, while the charge collection efficiency drops with light intensity for the FAPbI₃-based cells. However, for the MAPbI₃ and the mixture, the charge collection efficiency stays constant for a wide range of light intensities.
The structure of the cell: FTO glass/blocking layer (compact TiO2)/ mesoporous TiO2/ hybrid organic-inorganic Perovskite/gold. The layer of perovskite contains MAPbI3, FAPbI3, or a mixture of both. The colors in the crystalline structures represent Pb (light blue), iodide (brown), carbon (blue) nitrogen (orange) and hydrogen (white).

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