Journal Article ITO-free devices top-illuminated devices AgNWs transparent electrode ITO‐free devices Review all-polymer solar cells battery performance regulation building integrated photovoltaic composite electrode conductivity conjugated self‐assembled monolayers flexible flexible organic photovoltaics functional mediators hole transporting layers hybrid electrodes intrinsically stretchable organic photovoltaics large-area devices lithium metal batteries molecular orientation optical path organic photovoltaics organic solar modules organosulfur reflection semitransparent photovoltaic solar energy stretchability stretchable organic photovoltaics