Functionalization of mesoporous titanium dioxide (TiO2) with perylene monoimide self-assembled monolayer for highly efficient perovskite solar cells

Paola Vivo^a, Zafar Ahmed^a, Alexander Efimov^a, Helge Lemmetyinen^a

^aTampere University of Technology, Finland, Tampere, Finland

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, Paola Vivo, 423
Publication date: 5th February 2015

A new promising class of light harvesting materials, namely the hybrid organic halide based perovskites, have been recently employed to realize high eﬃciency photovoltaic solar cells[1]. This kind of crystalline material shows good properties in terms of light harvesting (high absorption in a broad region of the visible spectrum) and electron and hole mobilities [2,3]. Research on perovskite solar cells has evolved rapidly during the past five years, and in 2014 a new record certified nonstabilized power conversion efficiency (PCE) of 20.1 % was achieved by KRICT [4]. Recently, the functionalization of titanium dioxide (TiO₂) with fullerene (C₆₀) SAM in perovskite-polymer cells has been reported [5] as a new exciting and versatile route forward for hybrid photovoltaics. In this work for the first time we functionalize a mesoporous TiO₂with self-assembled perylene monoimide (PMI) monolayer synthesized in our laboratory (Figure 1). The mechanism of charge generation in such a hybrid inorganic-organic nanostructure is studied by pump-probe transient absorption spectroscopy. Moreover, the hybrid systems are characterized by scanning electron- and transmission electron microscopy. Final aim of this work is to combine the PMI self-assembled monolayer (PMI SAM) on mesoporous titania with a perovskite absorber (CH₃NH₃PbI₃ halide), and a light absorbing polymer hole-conductor (such as poly(3-hexylthiophene), P3HT, or 2,2',7,7'-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene, Spiro-OMeTAD) to develop highly efficient hybrid solar cells.
Figure 1. Molecular structure of perylene monoimide (PMI)
[1] Lee, M.M.; Teuscher, J.; Miyasaka, T.; Murakami, T.N.; Snaith, H.J. Efficient hybrid solar cells based on meso-superstructured organometal halide perovskites. Science 2012, 338, 643. [2] Kojima, A.; Teshima, K.; Shiai, Y.; Miyasaka, T. Organometal halide perovskites as visible-light sensitizers for photovoltaic cells. J. Am. Chem. Soc. 2009, 131, 6050. [3] Gao, P.; Nazeeruddin, M.K.; Grätzel, M. Sequential deposition as a route to high-performance perovskite-sensitized solar cells. Nature 2013, 499, 316. [4] Best research-cell efficiencies, National Renewable Energy Laboratory (NREL), 18 December 2014, http://www.nrel.gov/ncpv/images/efficiency_chart.jpg. [5] Abrusci, A; Stranks, S. D.; Docampo, P.; Yip, H.-L.; Jen, A.K.-Y.; Snaith, H.J. High performance perovskite-polymer hybrid solar cells via electronic coupling with fullerene monolayers. ACS Nano 2013, 13, 3124-3128.

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