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

^aOkinawa Institute of Science and Technology (OIST),, 1919-1 Tancha, Onna-son, Okinawa, Japan

NIPHO
Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)

València, Spain, 2017 March 1st - 2nd

Organizers: Hendrik 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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