Journal Article organic solar cells all-inorganic perovskites all-polymer solar cells conjugated polymer crystallization kinetics device stability difluorobenzoxadiazole donor polymers electron mobility hole-transporting materials homo-tandem intrinsic mobility in donors inverted perovskite solar cells low driving force mild post-treatment morphology stability non-fullerene acceptors nonfullerene organic solar cells open-circuit voltage passivation effect polymer acceptors polymer conformation polymer solar cells random polymerization strategy recombination layers small-molecular acceptors topology vinylene-linkers