Organic-inorganic perovskites were treated with a CsI solution to improve the photovoltaic performance and stability. Due to the formation of CsPbI3 and trap filling in Cs-0.05(FA(0.83)MA(0.17))(0.95)Pb(I0.83Br0.17)(3) perovskites by CsI treatment, the power conversion efficiency was improved to 20.48%. The CsI-treated perovskites exhibited slower degradation under heating at 180 degrees C than the untreated perovskites.
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