Additive Engineering for Highly Efficient and Stable Perovskite Solar Cells
Seok Sang II a
a School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan. Korea
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Kyōto-shi, Japan, 2019 January 27th - 29th
Organizers: Hideo Ohkita, Atsushi Wakamiya and Mohammad Nazeeruddin
Keynote, Seok Sang II, presentation 090
Publication date: 23rd October 2018

Over the last several years, inorganic-organic hybrid perovskites have shown dramatic achievements in photovoltaic performance and device stability via additive engineering. In addition to the role of antisolvents in solvent engineering processes to control nucleation and crystal growth, precursor-coordinating molecule interactions in solution are also affected by various additives. Therefore, additives contribute not only to the formation of uniform and dense cotings but also to efficiency and stability improvement due to defect concentration and passivation effect of the resultant perovskite film. Furthermore, as far as the fabrication of perovskite solar cells by the solution process is concerned, it is necessary to consider not only the chemical factors of the precursor solution but also the physical properties of the coating solution such as viscosity, evaporation rate of solvents, the wettability and penetration onto substrates. Fundamentals understanding of precursor solution chemistry with additives will be able to achieve further improved photovoltaic performance and device stability. Various additives such as a cation or an anion are capable of functioning as active species in improving the quality of perovskite films. In this presentation, structural evolution and function by additives such as a long alkylammonium halide and metal halide etc. will be presented.

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