Journal Article 1H and 13C Comparative Study NMR Plant Extracts Research Support, Non-U.S. Gov't Triterpenes alleviating energy barrier charge transport layers conducting polymers conformer diketopyrrolopyrrole‐based polymers ecofriendly colloidal nanocrystals hole accumulation hybrid perovskite/organic structure molecular dynamics promoting near‐infrared photocurrent protopanaxadiol protopanaxatriol self-consistent-charge density functional tight-binding solar cells sub‐nanometer dipole layer surface chemistry