Table 1.

Literature survey on the polarity of OIHPs with various compositions.

Composition	Non-polar	Polar
MAPbCl3	Refs [66,86]	Ref. [39]
MAPbBr3	Refs [19,66,87–89]	Refs [39,73,90]
MAPbI3	Refs [5,12,19,42,44,45,59,60,62,68,91]	Refs [6,41,47–58,76,83,92]
FAPbBr3		Ref. [94]
FAPbI3	Ref. [95]10.1021/acs.jpclett.7b03296	Ref. [93]
CsPbCl3	Refs [96–98]
CsPbBr3	Ref. [99]	Refs [100,101]
CsFAMAPbIxBr3−x	Ref. [63]