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. 2018 Nov 1;8(11):897. doi: 10.3390/nano8110897

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Field emission scanning electron microscope (FE-SEM) images of CH₃NH₃PbI₃ (MAPbI₃) films obtained from 6–12 mg/mL CH₃NH₃I (MAI) in (a₁–d₁) isopropanol (IPA), (a₂–d₂) n-butyl alcohol (NBA), (a₃–d₃) n-amyl alcohol (NAA), and (a₄–d₄) n-hexyl alcohol (NHA). The scale bars of a₁–d₄ are 1 μm, and those of inserts are 200 nm.