Highly (100)-oriented CH3NH3PbI3(Cl) perovskite solar cells prepared with NH4Cl using an air blow method

Takeo Oku; Yuya Ohishi; Naoki Ueoka

doi:10.1039/c7ra13582c

Highly (100)-oriented CH₃NH₃PbI₃(Cl) perovskite solar cells prepared with NH₄Cl using an air blow method

RSC Adv. 2018 Mar 15;8(19):10389-10395. doi: 10.1039/c7ra13582c. eCollection 2018 Mar 13.

Authors

Takeo Oku¹, Yuya Ohishi¹, Naoki Ueoka¹

Affiliation

¹ Department of Materials Science, The University of Shiga Prefecture 2500 Hassaka Hikone Shiga 522-8533 Japan oku@mat.usp.ac.jp.

Abstract

The effects of adding NH₄Cl via an air blow process on CH₃NH₃PbI₃(Cl) perovskite solar cells were investigated. CH₃NH₃PbI₃(Cl) solar cells containing various amounts of NH₄Cl were fabricated by spin-coating. The microstructures of the resulting cells were investigated by X-ray diffraction, optical microscopy, and scanning electron microscopy. The current density-voltage characteristics of the cell were improved by adding an appropriate amount of NH₄Cl and air blowing, which increased the photoconversion efficiency to 14%. Microstructure analysis indicated that the perovskite layer contained dense grains with strong (100) orientation, as a result of NH₄Cl addition and air blowing. The ratio of the (100)/(210) reflection intensities for the perovskite crystals was 2000 times higher than that of randomly oriented grains. The devices were stable when stored in ambient air for two weeks.