nanoGe - HOPV15 - Simulation of hysteresis in Current - Voltage characteristics in Perovskite Solar Cells

Simulation of hysteresis in Current - Voltage characteristics in Perovskite Solar Cells

Francesco Santoni^a, Desirée Gentilini^a, Aldo Di Carlo^a

^aUniversity of Rome (Tor Vergata), Via del Politecnico, 1, Roma, 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

Poster, Desirée Gentilini, 416
Publication date: 5th February 2015

Perovskite Solar Cells (PSC) represent an important photovoltaic (PV) technology based on solution processes and organic or hybrid organic/inorganic energy harvesting materials. A milestone on the introduction of hybrid Perovskites as sensitizer and charge transport material [1] has further boosted the development of this PV technology leading to certified efficiency above 20% certified on small area devices [2] and above 10% on mini-module level [3]. Nevertheless PSC show an unraveled hysteresis behavior [4], which can be detrimental for the developing of this technology. This contribution reports on the effort made to develop a consistent simulation model to describe Perovskite Solar Cells (PSCs). The model, based on drift-diffusion equations, [5] uses Gaussian density of states and hopping mobility for transport in the organic materials [6] and is able to simulate IV-characteristics, external quantum efficiency, as well as, electric field and carrier density profiles of the PV cell. A detailed discussion will be devoted to the understanding of switching of photovoltaic behavior due to a polarization of the device [7]. We will show a comparison between the effects of ionic motion induced P-I-N junction proposed in [7] and the ferroelectric domain orientation [8] in explaining this hysteresis characteristics. This casts light on the physical effects underlying the photoconversion and pave the way to possible routes for optimization of the device.

[1] M. M. Lee, J. Teuscher, T. Miyasaka, T.N. Murakami, HJ. Snaith Science (2012),Vol. 338 no. 6107 [2] NREL, http://www.nrel.gov/ncpv/images/efficiency_chart.jpg [3] A. Di Carlo et al. Proc. IEEE Nanotechnology 2014, Toronto (CA); Proc. PVSEC 2014, Amsterdam (NL) [4] E. L. Unger et al. Energy Environ. Sci., (2014),7, 3690-3698 [5]www.tibercad.com [6] Francesco Santoni, Alessio Gagliardi, MatthiasAufderMaur, Aldo Di Carlo,OrganicElectronics, 15, 1557 (2014) [7] Xiao Z., et al Nature Materials 14, 193–198 (2015) [8] Kutes, Y.J. Phys. Chem. Lett., 2014, 5 (19), pp 3335–3339

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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.

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