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. 2019 Aug 9;10:3624. doi: 10.1038/s41467-019-11567-1

Fig. 3.

Fig. 3

SEM images of FAPbI3 films and EQE distribution of PeLEDs. Films and PeLEDs are fabricated with different concentrations of precursor solutions. a 20 wt.%. b 15 wt.%. c 10 wt.%. d 7 wt.%. e 5 wt.%. Scale bar, 1 μm. f Peak EQE distribution for devices with different concentrations. More than 20 devices for each concentration. Error bars correspond to the standard deviation