Spiro-MeOTAD Hole Transport Layer in Perovskite-based Solar Cells
Michael Lee a, Shenghao Wang a, Andrew Winchester a, Atsushi Gabe a, Yan Jiang a, Yabing Qi a, Yuichi Kato a, Matthew Leyden a, Emilio Juarez-Perez a, Sonia Raga a, Zafer Hawash a, Luis Ono a, Mikas Remeika a
a Okinawa Institute of Science and Technology (OIST),, 1919-1 Tancha, Onna-son, Okinawa, Japan
nanoGe Perovskite Conferences
Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
València, Spain, 2017 March 1st - 2nd
Organizers: Henk Bolink and David Cahen
Poster, Luis Ono, 023
Publication date: 18th December 2016

In organic-inorganic hybrid perovskite solar cells, optimization of hole transport materials (HTMs) is important for enhancing solar power conversion efficiency and improving stability. At OIST, a team of researchers in the Energy Materials and Surface Sciences Unit has been making concerted efforts to study 2,2’,7,7’-tetrakis[N,N-di-(4-methoxyphenyl)amino]-9,9’-spirobifluorene (spiro-MeOTAD), which is the most widely used HTM in perovskite solar cells [1-7]. In this talk, we will present our latest understanding of fundamental interactions between Li-bis(trifluoromethanesulfonyl)-imide (LiTFSI), 4-tert-butylpyridine (t-BP) and spiro-MeOTAD. We will also show how gas exposure (e.g., exposure to O2, H2O, N2) influences electronic structures and conductivity of such HTM films. In addition, we will propose further strategies to improve perovskite solar cell performance and stability [4,6]. 

[1] E.J. Juarez-Perez, M.R. Leyden, S. Wang, L.K. Ono, Z. Hawash, Y.B. Qi*, Chem. Mater. 28 (2016) 5702.

[2] Z. Hawash, L.K. Ono, Y.B. Qi*, Adv. Mater. Interfaces 3 (2016) 1600117.

[3] Z. Hawash, L.K. Ono, S.R. Raga, M.V. Lee, Y.B. Qi*, Chem. Mater. 27 (2015) 562.

[4] L.K. Ono+, S.R. Raga+, M. Remeika, A.J. Winchester, A. Gabe, Y.B. Qi*, J. Mater. Chem. A 3 (2015) 15451 (+These authors contributed equally)

[5] Y. Kato, L.K. Ono, M.V. Lee, S. Wang, S.R. Raga, Y.B. Qi*, Adv. Mater. Interfaces 2 (2015) 1500195.

[6] M.C. Jung, S.R. Raga, L.K. Ono, Y.B. Qi*, Sci. Rep. 5 (2015) 9863.

[7] L.K. Ono, P. Schulz, J.J. Endres, G.O. Nikiforov, Y. Kato, A. Kahn, Y.B. Qi*, J. Phys. Chem. Lett. 5 (2014) 1374



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