Spiro-MeOTAD Hole Transport Layer in Perovskite-based Solar Cells

Yabing Qi^a, Yan Jiang^a, Atsushi Gabe^a, Andrew Winchester^a, Michael Lee^a, Shenghao Wang^a, Mikas Remeika^a, Luis Ono^a, Zafer Hawash^a, Sonia Raga^a, Emilio Juarez-Perez^a, Matthew Leyden^a, Yuichi Kato^a

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

Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)

Yokohama-shi, Japan, 2017 February 2nd - 4th

Organizers: Tsutomu Miyasaka and Iván Mora-Seró

Oral, Luis Ono, presentation 078
Publication date: 7th November 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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