Importance of PbI
2
morphology in two-step deposition of CH
3
NH
3
PbI
3
for high-performance perovskite solar cells
Wei Hui
1, 2
, Tang Yang
1, †
, Feng Bo
1
, You Hui
2
SEM images of PbI
2
fabricated with method A, B, C, and D, respectively.