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The Role of Dimethylammonium Iodide in CsPbI 3 Perovskite Fabrication: Additive or Dopant?

The Role of Dimethylammonium Iodide in CsPbI 3 Perovskite Fabrication: Additive or Dopant?

Yong Wang, Xiaomin Liu, Taiyang Zhang, Xingtao Wang, Miao Kan, Jielin Shi, Yixin Zhao

Angew Chem Int Ed Engl. 2019 Nov 11;58(46):16691-16696.

PMID: 31538395

Abstract:

The controllable growth of CsPbI3 perovskite thin films with desired crystal phase and morphology is crucial for the development of high efficiency inorganic perovskite solar cells (PSCs). The role of dimethylammonium iodide (DMAI) used in CsPbI3 perovskite fabrication was carefully investigated. We demonstrated that the DMAI is an effective volatile additive to manipulate the crystallization process of CsPbI3 inorganic perovskite films with different crystal phases and morphologies. The thermogravimetric analysis results indicated that the sublimation of DMAI is sensitive to moisture, and a proper atmosphere is helpful for the DMAI removal. The time-of-flight secondary ion mass spectrometry and nuclear magnetic resonance results confirmed that the DMAI additive would not alloy into the crystal lattice of CsPbI3 perovskite. Moreover, the DMAI residues in CsPbI3 perovskite can deteriorate the photovoltaic performance and stability. Finally, the PSCs based on phenyltrimethylammonium chloride passivated CsPbI3 inorganic perovskite achieved a record champion efficiency up to 19.03 %.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP51066741	Dimethylammonium iodide		51066-74-1	Price

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