Effect of large cation- HAI of long carbon chain on double-cations perovskite
a Department of Photonics, National Cheng Kung University, 70101 Tainan, Taiwan, ROC
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
Poster, YA-HSIN HUANG, 098
Publication date: 23rd October 2018

Organic-inorganic hybrid perovskite formamidinium cesium lead triiodide NH2CHNH2CsPbI3 (FACsPbI3) has better thermal stablity than methylammonium lead triiodide CH3NH3PbI3 (MAPbI3), so it be research recently. And in order to improve the efficiency and ambient stability, the FA0.9Cs0.1PbI3 perovskite precursor is added the other larger cation hexylammonium iodide(HAI) and after annealing to form 2D-3D mixed peroskite, that will improve the stability in ambient atmosphere, because the 2D structure has better moisture barrier abilities than the 3D structure. And then the 2D-3D mixed peroskite of HAI2(FA0.9Cs0.1)n-1PbnI3 perovskite films are post-treated with hexylammonium iodide through spin-coating again. However, it can form a protective layer on the surface of perovskite to barrier the surrounding, and the moleculers of cations will flow into the grain boundaries to reduce defects between grain boundaries, and make the electrons and holes transfer easier to improve the efficiency of the perovskite. After our experiments, it was found that the post-treated cells actually increased efficiency by about 2%, and have better moisture stability. 

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