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. 2017 Mar 20;7:44629. doi: 10.1038/srep44629

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Copyright © 2017, The Author(s)

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Markers represent the measured free energy μ_oc of electron-hole pairs in perovskite and perovskite-based heterojunctions as a function of the excitation intensity (I_ex) delivered by a CW laser at 532 nm. Lines are provided as a guide to the eye to identify the slope of the data. The ideality factor deviates from the 1.5 value of the single hybrid perovskite layer, increasing to 2 when I_ex exceeds a threshold that is peculiar to each type of heterojunction.