Journal Article perovskite light-emitting diodes quasi-2D perovskites Research Support, Non-U.S. Gov't Sn‐Pb abietic acid alkali-metal cations bifunctional zwitterions blue perovskite LEDs carrier extraction copper dendrites copper oxide crystallization kinetics crystallization modulation engineered facets excitons hard carbons hot-electron injection hydrogen evolution inorganic perovskite solar cells lithium-ion batteries low bandgap narrow phase distribution perovskite phase distribution potassium-ion batteries pouch cells self-assembly self‐elimination sodium-ion batteries