Journal Article pseudo‐planar heterojunction blade‐coating organic solar cells pseudo-planar heterojunction vertical gradient distribution Adhesives Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. all-polymer solar cells binary-dilution strategy charge transport crack onset strain efficiency stretchability factor exciton diffusion flexible organic solar cells large-area blade-coating devices mechanical stability metal complex acceptor organic photovoltaics patterned meniscus self‐assembly sequential blade-coating sequential deposition stability terpolymer acceptors trap density