70th CEMS Colloquium

Title

Materials Science for Highly Efficient Perovskite Solar Cells

Abstract

As cost-effective next generation printable photovoltaics, perovskite solar cells have attracted much attention. In a relatively short period, power conversion efficiencies (PCEs) in such cells have been significantly increased, due in large part to improvements of the fabrication protocols for the perovskite layer as well as the development of new materials for charge collection layers.

Our approaches and contributions to this emerging field regarding efficient lead and lead-free perovskite solar cells are as follows.
1) Development of highly purified perovskite precursor materials: We synthesis of a series of complexes of lead halides or tin halides as purified precursor for perovskite materials. ^[1]
2) Development of organic semiconductors as efficient charge-collection layer: We design and synthesis of novel pi-conjugated materials in terms of control of the energy level of frontier orbitals and molecular aggregation. ^[2]
3) Development of fabrication methods for perovskite layer by solution process: We focus on the intermediates formed during the solution process and develop efficient fabrication methods based on the mechanism. ^[3]

In this talk, we introduce our recent progress on tin halide perovskite solar cells as well as lead halide perovskites.

[1]
(a) A. Wakamiya, M. Endo, et al., Chem. Lett. 43, 711 (2014).
(b) M. Ozaki, A. Wakamiya, et al., ACS Omega 2, 7016 (2017).

[2]
(a) A. Wakamiya, H. Nishimura, et al., Angew. Chem. Int. Ed. 53, 5800 (2014).
(b) H. Nishimura, A. Wakamiya, et al., J. Am. Chem. Soc. 137, 15656 (2015).

[3]
(a) Y. Yamada, A. Wakamiya, Y. Kanemitsu, et al., J. Am. Chem. Soc. 136, 11610 (2014).
(b) Y. Yamada, A. Wakamiya, Y. Kanemitsu, et al., J. Am. Chem. Soc. 137, 10456 (2015).
(c) F. Yang, A. Wakamiya, K. Matsuda, et al., Adv. Mater. Interfaces 5, 1701256 (2018).
(d) J. Liu, M. Ozaki, S. Yakumaru, A. Wakamiya, et al. Angew. Chem. Int. Ed. 57, 13221 (2018).