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. 2016 Apr 5;7:11193. doi: 10.1038/ncomms11193

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(a) Schematic drawing of the experimental set-up for the photostrictive measurements. The AFM tip is fixed at one point on the sample to record the height as a function of time. (b) Photostriction in the MAPbI₃ single crystal. Both (100)_T- and (010)_T-oriented single crystals produce a similar elongation of ∼50 p.p.m. under 100 mW cm⁻² white-light illumination. The height change of a Si single crystal is also measured as a comparison. Cyan and green dash lines delineate the fast and slow components of the height change, respectively. (c) Light intensity dependence of the photostrictive effect. The inset shows the proportional relationship between the photostriction and light intensity. (d) A comparison between the height and current changes on light irradiation.