Table 1 List of studied samples and solar cells

Sample	Perovskite	Additive	Scan direction	V_oc [V]	J_sc [mA. cm⁻²]	FF [%]	PCE [%]	HI^a [%]
CsFAPI	Cs_0.1FA_0.9PbI₃	No	Reverse	0.943	23.91	72.13	16.26	26
CsFAPI	Cs_0.1FA_0.9PbI₃	No	Forward	0.846	23.83	59.36	11.96	26
CsFAPI/KC	K_0.09Cs_0.1FA_0.81PbI₃	KCl	Reverse	0.994	25.19	76.38	19.12	1
CsFAPI/KC	K_0.09Cs_0.1FA_0.81PbI₃	KCl	Forward	0.995	25.16	76.03	19.03	1
CsFAPI/AKC	K_0.05Cs_0.1FA_0.85PbI₃	KCl + NH₄Cl	Reverse	1.022	25.03	78.73	20.15	3
CsFAPI/AKC	K_0.05Cs_0.1FA_0.85PbI₃	KCl + NH₄Cl	Forward	1.016	24.96	76.92	19.51	3
RbCsFAPI	Rb_0.05Cs_0.1FA_0.85PbI₃	No	Reverse	1.017	24.49	76.12	18.96	24
RbCsFAPI	Rb_0.05Cs_0.1FA_0.85PbI₃	No	Forward	1.006	24.36	58.89	14.43	24
RbCsFAPI /KIAC	K_0.05Rb_0.05Cs_0.1 FA_0.8PbI₃	KI + NH₄Cl	Reverse	1.083	24.79	78.61	21.10	4
RbCsFAPI /KIAC	K_0.05Rb_0.05Cs_0.1 FA_0.8PbI₃	KI + NH₄Cl	Forward	1.072	24.66	76.74	20.29	4
MAPI	MAPbI₃	No	Reverse	1.037	21.83	76.32	17.25	17
MAPI	MAPbI₃	No	Forward	1.001	21.81	65.24	14.24	17
MAPI /Au_NPs	MAPbI₃	Au_NPs^b	Reverse	1.059	23.37	76.81	19.01	16
MAPI /Au_NPs	MAPbI₃	Au_NPs^b	Forward	1.047	23.11	66.12	16.02	16
FAPI	FAPbI₃	No	Reverse	0.915	23.45	66.76	14.32	29
FAPI	FAPbI₃	No	Forward	0.859	23.18	51.23	10.21	29
FAPI /MACl	FA_1-x MA_xPbI₃	MACl	Reverse	1.008	24.71	80.36	20.01	2
FAPI /MACl	FA_1-x MA_xPbI₃	MACl	Forward	1.003	24.69	78.58	19.46	2

Perovskite composition, additive, J-V curve parameters, PCE and hysteresis index of champion solar cells. No perovskite surface treatment.
^aHysteresis Index, noted HI, defined as (PCE_Rev − PCE_For)*100/PCE_Rev.
^bAu_NPs: Gold Nanoparticles.

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