Journal Article organic solar cells power conversion efficiency stability all-polymer solar cells 1,2,3‐benzothiadiazole 2,1,3‐benzothiadiazole additive aggregation regulation all‐polymer solar cells all‐polymer system all‐small‐molecule benzo[1,2-b:4,5-b′]difuran blade‐coating boron‐nitrogen molecule burn-in loss reductions charge recombination charge separation charge transport charge trapping cuffless blood pressure (BP) monitoring detectivity device stability donor aggregation double cable polymer energy loss green solvent processing high‐dimensional charge transport channel isomeric solid additives isomerized solid additive