HIGHLIGHTS
SUMMARY
Although silicon is the most common solar cell material, the fabrication process is expensive. CH3 NH3 PbI3 (MAPbI3 ) compounds have been widely used for perovskite solar cells, and the MAPbI3 perovskite compound have tunable band gaps and easy fabrication process with low cost. To stabilize the perovskite structure, various kinds of cations such as formamidinium (HC(NH2 )2, FA), ethylammonium (CH3 CH2 NH3, EA), or guanidinium (C(NH2 )3, GA), which have larger ionic radii than methylammonium (CH3 NH3, MA), have been introduced at the MA site, and the fabricated cells were stable to . . .
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