The summarization of different strategies to improve the interfacial chemical reactions in nonfullerene OSCs.

Interfacial reaction	Strategies		Examples
Chemical reaction	(1) Designing new NFAs	(i) Adopting ring-locked C C vinyl linker	IDTT-R, IDTT-CR,78…
		(ii) Removing the C C vinyl linker	All-fused-ring of ITYM,79…
	(2) Interfacial modification	(i) Protonation of the amino group	a-PEIE,47 PEIE-CO2,47 PEIE-phosphoric acid,47…
		(ii) Chelation of metallic elements	PEI-Zn,43 ultra-thin PEIE-ITO,48…
		(iii) Chelation of small molecules	PEIE-EDT,80 PEIE-DBO,81…
	(3) Developing other chemically stable ETLs	(i) Modification the amine group	PEI-Zn,43 PDIEIE,82 functionalized PEIEs,83 PDMA(N)EMA,84 PBI-2P,85 PFN-Br,87…
		(ii) Designing other chemically stable ETLs	OSiOD,86…