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. 2023 Mar 28;3(3):230–240. doi: 10.1021/acsnanoscienceau.2c00065

Figure 1.

Figure 1

Time evolution of SAED patterns for MAPbI3 films which are exposed to the atmosphere for 2 min. (a–d) Initial SAED pattern matches the [501] zone axis in tetragonal MAPbI3. Additional spots appear at 10 s (total dose ∼ 42.1 eÅ–2) as marked by yellow circles. After 30 s (total dose ∼ 126.3 eÅ–2), twin peaks are observed as marked by white circles. (e) Time evolution of the rotationally averaged SAED pattern for MAPbI3 observed in TEM for samples which are exposed to air (2 min). The dose rate is ∼4.21 eÅ–2 s–1.