Zinc　oxide　(ZnO)　is　widely　used　as　an　electron　transporting　layer　(ETL)　for　organic　solar　cells　(OSCs).　Here,　a　low-cost　commercial　water/alcohol-soluble　fluorescent　conversion　agent,　sodium　2,2′-([1,1′-biphenyl]−4,4′-diyldivinylene)-bis(benzenesulfonate)　(CBS),　is　incorporated　into　ZnO　to　develop　a　novel　organic-inorganic　hybrid　ETL　for　high-performance　OSCs.　The　photoinduced　charge　transfer　from　CBS　to　ZnO　significantly　improves　the　charge　transport　properties　of　ZnO,　resulting　in　faster　electron　extraction　and　reduced　charge　recombination　in　OSC　devices　with　ZnO:CBS　ETLs.　ZnO:CBS-based　devices　exhibit　higher　power　conversion　efficiencies　(PCEs)　than　their　pure　ZnO-based　counterparts,　especially　in　devices　with　a　thicker　ETL,　which　is　more　suitable　for　roll-to-roll　and　large-area　module　processing.　Furthermore,　the　strong　ultraviolet-light　absorption　capability　of　CBS　inhibits　the　photodegradation　of　the　active　layer,　improving　the　photostability　of　ZnO:CBS　based　OSC　devices.　Therefore,　this　work　provides　a　simple　and　effective　strategy　for　realizing　high-performance　OSCs　with　high　PCE　and　good　photostability,　which　can　further　facilitate　the　commercialization　of　OSCs.　©　2023　Wiley-VCH　GmbH.